3/4 inch to 12 miles. If the distance from city A to B is 7.5 , how far apart are the two cities

Question

Proportion

Answer 1

3/4:12 = 0.75:12 scale

Set up a proportion "miles is to inches as miles is to inches" 

x is to 7.5 as 12 is to 0.75

 

x/7.5 = 12/0.75

 

0.75x = 12(7.5)

x = 12(7.5)/0.75

x = 120 miles