Part c-map scale architects, toy and game designers, even transportation engineers represent real things and places with models that are smaller than the thing they represent. each of these models has a particular scale, or relationship between the size of the model and the size of the actual thing it depicts. cartographers do the same thing in making maps. the ratio of the size of a map to that area in the real world is the map's scale. maps are useful because they provide a great deal of information that is intuitive to understand. as a schoolteacher, you would like to create a globe for your desk. while there are companies that create beautiful handmade globes, such as the globe in figure c1 below, your budget will only support a homemade globe. you've decided to paint a common fruit to use as a globe to introduce your students to the concept of map scale. you will have to decide what scale you want your globe to be, just like the globe makers do. pearson you have decided to use a grapefruit as your globe. you need to figure out an appropriate scale to use. to do this: 1. find the circumference of earth. it is ~40,000 km. 2. measure the circumference of the grapefruit. it is ~22 cm. 3. convert those two measurements into the same units. there is 1 cm per km. 4. correctly express the maps scale such that map units / ground units = 1 / the scale. insert the values in this equation and solve for the scale. thus, 22 cm / 4,000,000,000 = 1/x. solve for x. view available hint(s) hint 1. estimating map scale the key to estimating map scale is remembering that it is a ratio that represents the relationship between the model/map and the reality it represents. the initial number is always 1 and the second number is usually larger because it generally represents something that is larger in real life.