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    Question

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

    (6k - 6). (Note: 'k' is the largest single-digit prime number.)
    A 54 Correct Answer Incorrect Answer
    B 60 Correct Answer Incorrect Answer
    C 68 Correct Answer Incorrect Answer
    D 72 Correct Answer Incorrect Answer

    Solution

    'k' = 7 2k - 2 = 2 ├Ч 7 - 2 = 12 4k - 4 = 4 ├Ч 7 - 4 = 24 6k - 6 = 6 ├Ч 7 - 6 = 36 Let the fourth proportion be 'm'. 12 : 24 :: 36 : m So, 12 ├Ч m = 24 ├Ч 36 Or, 'm' = 72

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