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    Question

    Find the third proportional to 13 and

    52?
    A 147 Correct Answer Incorrect Answer
    B 208 Correct Answer Incorrect Answer
    C 126 Correct Answer Incorrect Answer
    D 192 Correct Answer Incorrect Answer

    Solution

    Third proportional = a : b :: b : c It can be written as = b2 = ac   Here, a : b : c = 13 : 52 : c => 52 × 52 = 13 × c => c = (52 × 52)/13 = 208

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