How do you solve \frac { 21} { 36} = \frac { 4.8} { d }?

2 Answers
Sep 23, 2017

d = 8.228571

Explanation:

Step One: Cross multiply

21 * color(red)(d) = 4.8 * color(red)(36)

that gives us

color(green)(21d) = color(green)(172.8)

Step two: divide both sides by 21

(21d)/color(blue)(21) = 172.8/color(blue)(21)

this gives us the answer ...

color(darkgreen)(d = 8.228571

Sep 23, 2017

8.22

Explanation:

21/36 = 4.8/d
Cross multiply
21d = 4.8*36
21d = 172.8
Divide both sides by 21
(21d)/21= 172.8/21
=8.22