17.78 is what percent of 21.31 - 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 21.31 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 21.31, so we can write it down as 100%=21.31.
4. We know, that x% equals 17.78 of the output value, so we can write it down as x%=17.78.
5. Now we have two simple equations:
1) 100%=21.31
2) x%=17.78
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%=21.31/17.78
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 17.78 is what percent of 21.31

100%/x%=21.31/17.78
(100/x)*x=(21.31/17.78)*x       - we multiply both sides of the equation by x
100=1.1985376827897*x       - we divide both sides of the equation by (1.1985376827897) to get x
100/1.1985376827897=x
83.435007038949=x
x=83.435007038949

now we have:
17.78 is 83.435007038949% of 21.31