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Question
Find the third proportional to 5.25, 7
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Solution
Let the required third proportional be x
∴ 5.25, 7, x are in continued proportion
⇒ 5.25 : 7 = 7 : x
⇒ 5x = 7 × 7
⇒ x = `(7xx7)/5.25`
⇒ x = `49/5.25=28/3`
⇒ x = `9 1/3`
∴ Required proportional = `9 1/3`
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