If `a/b = c/d` prove that each of the given ratios is equal to
`(5a + 4c)/(5b + 4d)`
Let `a/b = c/d = k`
Then a = bk and c = dk
`(5a + 4c)/(5b + 4d)` = `(5(bk) + 4(dk))/(5b + 4d) = (k(5b + 4d))/(5b + 4d) = k` = each given ratio
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Solution If `A/B = C/D` Prove that Each of the Given Ratios is Equal to `(5a + 4c)/(5b + 4d) Concept: Proportions.