78.2 is what percent of 138.21 - 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 138.21 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 138.21, so we can write it down as 100%=138.21.
4. We know, that x% equals 78.2 of the output value, so we can write it down as x%=78.2.
5. Now we have two simple equations:
1) 100%=138.21
2) x%=78.2
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%=138.21/78.2
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 78.2 is what percent of 138.21

100%/x%=138.21/78.2
(100/x)*x=(138.21/78.2)*x       - we multiply both sides of the equation by x
100=1.7673913043478*x       - we divide both sides of the equation by (1.7673913043478) to get x
100/1.7673913043478=x
56.580565805658=x
x=56.580565805658

now we have:
78.2 is 56.580565805658% of 138.21