15.21 is what percent of 31.8 - 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 31.8 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 31.8, so we can write it down as 100%=31.8.
4. We know, that x% equals 15.21 of the output value, so we can write it down as x%=15.21.
5. Now we have two simple equations:
1) 100%=31.8
2) x%=15.21
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%=31.8/15.21
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 15.21 is what percent of 31.8

100%/x%=31.8/15.21
(100/x)*x=(31.8/15.21)*x       - we multiply both sides of the equation by x
100=2.0907297830375*x       - we divide both sides of the equation by (2.0907297830375) to get x
100/2.0907297830375=x
47.830188679245=x
x=47.830188679245

now we have:
15.21 is 47.830188679245% of 31.8