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    Question

    If the third proportion of 27 and 36 is “0.5k”, then

    find the value of (k − 36) : (k + 12).
    A 5:9 Correct Answer Incorrect Answer
    B 4:7 Correct Answer Incorrect Answer
    C 1:2 Correct Answer Incorrect Answer
    D 3:8 Correct Answer Incorrect Answer

    Solution

    Third proportion of two numbers ‘a’ and ‘b’ is (b²/a).
    So, 0.5k = (36²/27) = 48
    Or, 'k' = 96
    Required value = (96 - 36) : (96 + 12) = 60 : 108 = 5 : 9

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