21.7 is what percent of 23.9 - 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 23.9 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 23.9, so we can write it down as 100%=23.9.
4. We know, that x% equals 21.7 of the output value, so we can write it down as x%=21.7.
5. Now we have two simple equations:
1) 100%=23.9
2) x%=21.7
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%=23.9/21.7
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 21.7 is what percent of 23.9

100%/x%=23.9/21.7
(100/x)*x=(23.9/21.7)*x       - we multiply both sides of the equation by x
100=1.1013824884793*x       - we divide both sides of the equation by (1.1013824884793) to get x
100/1.1013824884793=x
90.794979079498=x
x=90.794979079498

now we have:
21.7 is 90.794979079498% of 23.9