Question

The rectangles are similar. Find x.

Answer 1

12/18 = 5/x

12x = 18 × 5

12x = 90

x = 90 ÷ 12

x = 7,5 => x = 7 1/2

Answer 2

x = 7 1/2

Explanation:

We can use proportions to solve

12 5

----- = -----

18 x

Using cross products

12x = 18*5

12x = 90

Divide by 12

12x/12 = 90/12

x = 7 1/2