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Question

What is the third proportional to 10 and 20?

The correct answer is

40

The third proportional a/b = b/c

where a = 10, b = 20 and c is the third proportional.

∴ The third proportional to 10 and 20 = 202/10 = 40

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Important Questions from Third Proportional

  1. Find the third proportional to 6 and 12.

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

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

  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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