Question

    Find the fourth proportion of (3k), (4k), and (6k). (Note:

    'k' is the smallest two-digit prime number.)
    A 85 Correct Answer Incorrect Answer
    B 86 Correct Answer Incorrect Answer
    C 87 Correct Answer Incorrect Answer
    D 88 Correct Answer Incorrect Answer

    Solution

    k = 11
    3k = 33
    4k = 44
    6k = 66
    33 : 44 :: 66 : m
    33m = 44 × 66 = 2904
    m = 2904 ÷ 33 = 88

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