Question

what is the answer?
please tell

Answer 1

Answer:

16 is the right answer..

Answer 2

Answer:

16, 8

Step-by-step explanation:

1st question

Let the third proportional to 9 and 12 be x

According to the question 9 : 12 :: 12 : x

⇒ 9/12 = 12/x

⇒ x = (12 × 12)/9

⇒ x = 16

∴ The third proportional to 9 and 12 is 16.

2nd question

Given: First value = 4 Second value = 16

Formula: Mean proportion = √(x × y) here x = first value y = second value

Calculation: Let mean proportion of 9 and 16 is x

Then 4/x = x/16

⇒ x^2 = 16 × 4

⇒ x^2 = 64

⇒ x = √64

⇒ x = 8

∴ The mean proportion of 4 and 16 is 8.