A professional photographer took a photograph of the entire group at the class reunion. He wants to enlarge the 4​-in.-by-6​-in. photo to a poster that is 36 in. long. What will the smaller dimension​ (width) of the poster​ be?

Question

The width of the poster will be

Answer 1

24 inches.

To find the width of the poster, we can set up a proportion based on the ratio of the smaller dimension of the original photo to the smaller dimension of the poster:

4 inches / 6 inches = x inches / 36 inches

Cross multiply to solve for x:

6x = 4 * 36
6x = 144
x = 144 / 6
x = 24

Therefore, the width of the poster will be 24 inches.