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Question Number 106665 by deep last updated on 06/Aug/20

$$\mathrm{Find}\mathrm{a}\mathrm{fourth}\mathrm{proportional}\mathrm{to}$$$$3,12\mathrm{and}15$$

Answered by nimnim last updated on 06/Aug/20

$$Letxbethefourthproportional.$$$$\therefore 3:12::15:x$$$$\Rightarrow 3x=12\times 15$$$$\Rightarrow x=\frac{12\times 15}{3}=60$$

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