Question

1. Find the third proportion to 5 and 10 *​

Answer 1

Consider x as the third proportional to 5, 10

5: 10 :: 10: x

5/10 = 10/x

5x = 10 × 10

x = (10 × 10)/ 5 = 20

Hence, the third proportional to 5, 10 is 20.