📢 Too many exams? Don’t know which one suits you best? Book Your Free Expert 👉 call Now!


    Question

    Find the fourth proportion of (2k - 4), (4k - 8) and

    (6k - 12). (Note: 'k' is the largest single-digit composite number.)
    A 56 Correct Answer Incorrect Answer
    B 70 Correct Answer Incorrect Answer
    C 84 Correct Answer Incorrect Answer
    D 98 Correct Answer Incorrect Answer

    Solution

    'k' = 9 2k - 4 = 2 × 9 - 4 = 14 4k - 8 = 4 × 9 - 8 = 28 6k - 12 = 6 × 9 - 12 = 42 Let the fourth proportion be 'm'. 14 : 28 :: 42 : m So, 14 × m = 28 × 42 Or, 'm' = 84

    Practice Next

    Relevant for Exams:

    ask-question