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Question

Find the third proportional to 6 and 12.

The correct answer is

24

Let the third proportional be ‘x’

6 : 12 ∷ 12 : x

⇒ 6/12 = 12/x

⇒ x = 24

∴ The third proportional of 6 and 12 = 24

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Important Questions from Third Proportional

  1. If p is the third proportional to 3, 9, then what is the fourth proportional to 6, p, 4?

  2. What is the third proportional to 10 and 25?

  3. What is the third proportional to 10 and 20?

  4. The third proportional to (x2 - y2) and (x - y) is:  

  5. If the third proportional of 3x2 and 4xy is 48, then find the positive value of y.

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