Question

    Find the third proportional to 15 and

    45?
    A 135 Correct Answer Incorrect Answer
    B 144 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 = 15 : 45 : c => 45 × 45 = 15 × c => c = (45 × 45)/15 = 135

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