Question

What is the value of x in the proportion 2/5 = 10/x? (show work)

Answer 1

2 10
— = —
5 x

Cross multiply
2x=5*10
2x=50
x=50/2
x=25

Answer 2

$\frac{2}{5} = \frac{10}{x} \\ cross \: multiply \\ 2x = 50 \\ x = \frac{50}{2} \\ x = 25$