72 is what percent of 728 - 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 728 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 728, so we can write it down as 100%=728.
4. We know, that x% equals 72 of the output value, so we can write it down as x%=72.
5. Now we have two simple equations:
1) 100%=728
2) x%=72
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%=728/72
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 72 is what percent of 728

100%/x%=728/72
(100/x)*x=(728/72)*x       - we multiply both sides of the equation by x
100=10.111111111111*x       - we divide both sides of the equation by (10.111111111111) to get x
100/10.111111111111=x
9.8901098901099=x
x=9.8901098901099

now we have:
72 is 9.8901098901099% of 728