21.7 is what percent of 51.5 - 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 51.5 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 51.5, so we can write it down as 100%=51.5.
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%=51.5
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%=51.5/21.7
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 51.5

100%/x%=51.5/21.7
(100/x)*x=(51.5/21.7)*x       - we multiply both sides of the equation by x
100=2.3732718894009*x       - we divide both sides of the equation by (2.3732718894009) to get x
100/2.3732718894009=x
42.135922330097=x
x=42.135922330097

now we have:
21.7 is 42.135922330097% of 51.5