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    Question

    What is the fourth proportional to 4, 9,

    16?
    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, => 4 : 9 :: 16 : x => 4x = 9 × 16 => x = (9 × 16)/4 = 36

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