Solving proportions (1\3)/(5) = (a)/(20)​

Question

Solving proportions

`(1\3)/(5) = (a)/(20)`​

Answer 1

a = 4/3

Explanation:

1/3 a

----- = -----

5 20

Using cross products

1/3 * 20 = 5a

20/3 = 5a

Divide each side by 5

20/3 * 1/5 = 5a/5

4/3 = a