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    Question

    Find the fourth proportion of (k + 3), (2k - 6), and (4k -

    9). (Note: 'k' is the smallest two-digit prime number.)
    A 36 Correct Answer Incorrect Answer
    B 38 Correct Answer Incorrect Answer
    C 40 Correct Answer Incorrect Answer
    D 42 Correct Answer Incorrect Answer

    Solution

    k = 11
    k + 3 = 14
    2k - 6 = 22 - 6 = 16
    4k - 9 = 44 - 9 = 35
    14 : 16 :: 35 : m
    14m = 16 × 35 = 560
    m = 560 ÷ 14 = 40

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