Question

    Find the third proportional to 12 and

    42?
    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 = 12 : 42 : c => 42 × 42 = 12 × c => c = (42 × 42)/12 = 147

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