Question

the first third and forth terms of a proportion are 18,9 and 5 respectively find the second term.

Answer 1

18:x::9:5
x=(18×5)÷9
x=90÷9
x=10//
Goodluck!!

Answer 2

$\: \huge\sf\underline \red{\underline{Answer࿐}}$

Let Second Term be X

For 18,x,9,5 to be in proportion

$\: \: \: \: 18 : x : \: : 9 : 5$

$⇒18 × 5 = 9 × x$

$\: ⇒x \: = \: 18 \: \times 5 \: = 10$

Hence, the second second term is 10