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    Question

    What is the fourth proportional to 5, 7,

    15?
    A 30 Correct Answer Incorrect Answer
    B 21 Correct Answer Incorrect Answer
    C 36 Correct Answer Incorrect Answer
    D 14 Correct Answer Incorrect Answer

    Solution

    Let the fourth proportion be x. Then, => 5 : 7 :: 15 : x => 5x = 7 × 15 => x = (7 × 15)/5 = 21

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