Question

What is the value of x in the proportion below? 1/2/4=x/28

Answer 1

`\large\boxed{x=(7)/(2)=3.5}`

Explanation:

`((1)/(2))/(4)=(x)/(28)\qquad\text{cross multiply}\\\\4x=\left((1)/(2\!\!\!\!\diagup_1)\right)\cdot28\!\!\!\!\!\!\diagup^(14)\\\\4x=14\qquad\text{divide both sides by 4}\\\\x=(14)/(4)\\\\x=(14:2)/(4:2)\\\\x=(7)/(2)`

Answer 2

depends on whether you meant (1/2)/4 or 1/ (2/4)

Explanation:

1/2 x

---------- = -------------

4 28

Using cross products

1/2* 28 = 4x

14 = 4x

Divide by 4

14/4 = 4x/4

7/2 =x

If you meant

1 x

---------- = -------------

2/4 28

1 * 28 = 2/4 x

28 = 1/2 x

Multiply each side by 2

28*2 = 1/2x*2

56 =x