Question

Write a proportion for the following problem. Eric is making a scale drawing of the ground floor of his house. If the scale is 2 in = 5 ft, what number of inches will he use for a length of 55 ft?

Answer 1

If you have 2:5 and you want to know ?:55 then we have to scale up 2:5 until the number on the right is 55. As 5 x 11 = 55. We know that 2x11= 22 is the answer. There are 22 inches to 55ft.