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If the third proportion of two numbers is 27 and the first number is 12, then find the 2nd number.

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If the third proportion of two numbers is 27 and the first number is 12, then find the 2nd number.
1). 16
2). 18
3). 14
4). 20


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Answered by on | Votes 2 |

To find the third proportion we use a formula b² = ac where a and b are two numbers and c is the third proportion of them.

⇒ b² = ac

⇒ b² = 27 × 12

∴ b = 18

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