21.9 is what percent of 27.75 - 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 27.75 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 27.75, so we can write it down as 100%=27.75.
4. We know, that x% equals 21.9 of the output value, so we can write it down as x%=21.9.
5. Now we have two simple equations:
1) 100%=27.75
2) x%=21.9
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%=27.75/21.9
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 21.9 is what percent of 27.75

100%/x%=27.75/21.9
(100/x)*x=(27.75/21.9)*x       - we multiply both sides of the equation by x
100=1.2671232876712*x       - we divide both sides of the equation by (1.2671232876712) to get x
100/1.2671232876712=x
78.918918918919=x
x=78.918918918919

now we have:
21.9 is 78.918918918919% of 27.75