Question

The first third and fourth terms of a proportion are 15,40 and 120 respectively. find the second term​

Answer 1

Answer:

$Let \: second \: term \: be \: x \\ </p><p>so \: 15, x, 40, 120 \: are \: in \: proportion \\ </p><p>that \: is \: 15 : x :: 40 : 120 \\ \frac{15}{x} </p><p> = \frac{40}{120} \\ \frac{15}{x} = \frac{1}{3} </p><p> \\ x = 45$