21.5 is what percent of 489 - step by step solution

To get the solution, we are looking for, we need to point out what we know.

1. We assume, that the number 489 is 100% - because it's the output value of the task.
2. We assume, that x is the value we are looking for.
3. If 100% equals 489, so we can write it down as 100%=489.
4. We know, that x% equals 21.5 of the output value, so we can write it down as x%=21.5.
5. Now we have two simple equations:
1) 100%=489
2) x%=21.5
where left sides of both of them have the same units, and both right sides have the same units, so we can do something like that:
100%/x%=489/21.5
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 21.5 is what percent of 489

100%/x%=489/21.5
(100/x)*x=(489/21.5)*x       - we multiply both sides of the equation by x
100=22.744186046512*x       - we divide both sides of the equation by (22.744186046512) to get x
100/22.744186046512=x
4.3967280163599=x
x=4.3967280163599

now we have:
21.5 is 4.3967280163599% of 489