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    Question

    Find the third proportional to 15 and

    30?
    A 100 Correct Answer Incorrect Answer
    B 60 Correct Answer Incorrect Answer
    C 120 Correct Answer Incorrect Answer
    D 90 Correct Answer Incorrect Answer

    Solution

    Third proportional = a : b :: b : c It can be written as = b2 = ac   Here, a : b : c = 15 : 30 : c => 30 × 30 = 15 × c => c = (30 × 30)/15 = 60

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