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    Question

    What is the fourth proportion of 13, 20 and

    26?
    A 40 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 => 13 : 20 :: 26 : d => d = (26 × 20)/13 => d = 40

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