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    Question

    What is the fourth proportional to 4, 5,

    16?
    A 20 Correct Answer Incorrect Answer
    B 14 Correct Answer Incorrect Answer
    C 33 Correct Answer Incorrect Answer
    D 42 Correct Answer Incorrect Answer

    Solution

    Let the fourth proportion be x. Then, => 4 : 5 :: 16 : x =>┬а4x = 16 ├Ч 5 =>┬аx = (16 ├Ч 5)/4 = 20

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