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    Question

    Find the mean proportion of 7.2 and

    16.2.
    A 10.8 Correct Answer Incorrect Answer
    B 18.5 Correct Answer Incorrect Answer
    C 15.8 Correct Answer Incorrect Answer
    D 21.5 Correct Answer Incorrect Answer

    Solution

    ATQ,

    Mean proportion of 'a' and 'b' = √ab

    So, required mean proportion = √(7.2 X 16.2)

    = √(6 X 1.2 X 6 X 2.7)

    = 6 X √(1.2 X 2.7)

    = 6 X √(3 X 0.4 X 3 X 0.9)

    = 6 X 3 X √(0.4 X 0.9)

    = 6 X 3 X √(0.36)

    = 6 X 3 X 0.6

    = 10.8

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