What is the fourth proportional to 3, 7, and 12?

Topic: Ratio and Proportion
Subtopic: Proportion

A21

B24

C28

D32

Explanation

Let fourth proportional be x. 3 : 7 :: 12 : x => 3/7 = 12/x => 3x = 84 => x = 28.

Exam Relevance

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