Question

A map of the United States has a scale of 1 inches = 300 miles. The distance on the map from Boise, Idaho, to Phoenix, Arizona, is about 2 1/2 inches. What is the actual distance from Boise to Phoenix?

Answer 1

The distance is 750 miles.

Explanation:

In order to find this, we create a proportion. On the left would be the scale factor. On the right would be the Idaho to Arizona distance.

1in / 300 mi = 2.5in / x mi

Now we can cross multiply to find the distance.

300 * 2.5 = 1 * x

750 mi = x