The scale on a map shows that 200 miles is represented by 5 inches on a map. which proportion can be used to find the distance
on the map, x, that represents 50 miles?

A proportion can be used to find the distance on the map that represents 50 miles, you can calculate this using the following steps:

200 miles ... 5 inches

50 miles ... x inch = ?

200 * x = 5 * 50

x = 5 * 50 / 200

x = 1.25 inch

The correct result would be x = 5 * 50 / 200.