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    Question

    What is the fourth proportional to 3, 8,

    15?
    A 30 Correct Answer Incorrect Answer
    B 21 Correct Answer Incorrect Answer
    C 36 Correct Answer Incorrect Answer
    D 40 Correct Answer Incorrect Answer

    Solution

    Let the fourth proportion be x. Then, => 3 : 8 :: 15 : x =>┬а3x = 15 ├Ч 8 =>┬аx = (15 ├Ч 8)/3 = 40

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