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Question
Find the value of x so that the given four numbers are in proportion:
7, 21, x and 45
Sum
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Solution
7 : 12 : x : 45
⇒ 21 × x = 7 × 45
⇒ x = `(7xx45)/21=45/3` = 15.
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Proportion as Equality of Two Ratios
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