Question

if a,b,c are in proportion.find 'a' if b=15 and c=40 ​

Answer 1

$given \\ b = 40 \\ c = 14 \\ if \: a \: b \: and \: c \: are \: in \: proportion \: then \\ a \times c = {b}^{2} \\ or \: a \times 40 = {15 }^{2} \\ or \: a = \frac{225}{40} \\ or \: a = 5.625$

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