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प्रश्न
If a : b = c : d, prove that: xa + yb : xc + yd = b : d.
योग
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उत्तर
Given: `a/b = c/d`
`(xa + yb)/(xc + yd) = b/d`
The alternendo property of ratios states that if: `a/b = c/d`
`(a + xb)/(c + xd) = b/d`
Rewrite the Left-Hand Side
`(xa + yb)/(xc + yd) = b/d`
Hence, by applying alternendo, we have shown:
`(xa + yb)/(xc + yd) = b/d`
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