): An R.F. Distance measured on the scale= 2.5 cm Ground distance= 10 miles= 10*1.6=, 4. fraction. Using the following scale, determine the length of the following line segments. The representative fraction scale presents the proportional relationship between map and ground distances in a different way. The first example at the right shows that earlier version â¦ This provides the representative fraction. Common Length and Distance Conversions ; Length or Distance Converter RF scales is also a text based scale but no units are shown. Because an R.F. 1: 250 000 km b) km km c) z 3. 1: 150 000 km b) km km c) 2. An RF of 1/50,000 or 1:50,000 means that one unit of measure on the map is equal to 50,000 units of â¦ Map Scales - Representative Fraction Scales 1. A representative fraction is the scale shown in a map as a ratio. Representative fractions may, therefore, specify map scale along a line at which deformation is minimal (nominal scale). Here are several examples: Scale Finder (Nigel James, Bodleian Library, Map Room). A representative ratio of 500,000:1 shown on a map means that one unit of distance in the map equals 500,000 units of distance on â¦ : a map scale in which figures representing units (as centimeters, inches, or feet) are expressed in the form of the fraction 1/x (as 1/250,000) or of the ratio 1:x to indicate that one unit on the map represents x units (as 250,000 centimeters) on the earth's surface. The RF is always written with the map distance as 1 and is independent of any unit of measure. These "representative fraction" scales mean that one unit of measurement on the map 1 inch or 1 centimeter represents 10,000 of the same units on the ground. The scale is a simple ratio of map to ground measurement with a colon between the two measurements . If the scale were 1:63,360, for instance, then 1 inch on the map would represent 63,360 inches or 1 mile on the Bar scales denote only the nominal or average map scale. Variable scales, like the one illustrated above right, show how scale varies, in this case by latitude, due to deformation caused by map projection. For example, a RF scale of 1 : 1,200 means that every one â¦ 1 inch (in) = 2.54 centimeters 1 centimeter (cm) = 0.39 inch 1 foot (ft) = 12 inches = 30.5 centimeters = 0.3 meter 1 yard (yd) = 36 â¦ Converting Between Scale Types of Historic and Topographic Maps, page 1 Converting Bar Scale to Representative Fraction (RF)/Ratio Scale English and Metric Measures of Length to use:. The continental United States depicted on a 62-inches wide wall map, has a representative fraction scale of 1:3,000,000. Definition of representative fraction. ), it means that the R.F. Converting Lexical Scale "1 inch represents 3.9 miles" to Representative Fraction (RF) and Ratio: First, I write the lexical scale as a fraction - 1 inch (on the map) / 3.9 miles (on the ground), then I convert the length unit mile to inches because the RF shows how many inches on the ground are represented by 1 inch on a map. is equal to 50000 of the same unit on the ground. 2. scales can be compared â¦ scale is a ratio, or fraction, that expresses the mathematical relationship between MAP and LAND, such as 1 : 24,000. which means "1 map unit is equivalent to 24,000 land units." carries no units (inches, centimeters, etc. Convert linear scales to representative fractions and vice-versa. Showing the entire world on a wall map that is 59.5 inches wide results in a representative fraction scale of â¦ Handy calculators are available online. Representative Fraction (R.F. 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