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    Question

    What is the fourth proportion of 17, 30 and

    51?
    A 90 Correct Answer Incorrect Answer
    B 50 Correct Answer Incorrect Answer
    C 60 Correct Answer Incorrect Answer
    D 70 Correct Answer Incorrect Answer

    Solution

    We know the formula to find the fourth proportion - => a : b = c : d => 17 : 30 :: 51 : d => d = (51 × 30)/17 => d = 90

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