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# If Three Quantities Are in Continued Proportion; Show that the Ratio of the First to the Third is the Duplicate Ratio of the First to the Second - ICSE Class 10 - Mathematics

#### Question

If three quantities are in continued proportion; show that the ratio of the first to the third is the duplicate ratio of the first to the second

#### Solution

Let x, y and z be the three quantities which are in continued proportion.
Then, x : y :: y : z ⇒ y2 = xz ….(1)
Now, we have to prove that
x : z = x: y2
That is we need to prove that
xy= x2z
LHS = xy2 = x(xz) = x2z = RHS [Using (1)]
Hence, proved.

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#### APPEARS IN

Selina Solution for Selina ICSE Concise Mathematics for Class 10 (2018-2019) (2017 to Current)
Chapter 7: Ratio and Proportion (Including Properties and Uses)
Ex.7B | Q: 11

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Solution If Three Quantities Are in Continued Proportion; Show that the Ratio of the First to the Third is the Duplicate Ratio of the First to the Second Concept: Proportions.
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