17.05 is what percent of 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 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 21, so we can write it down as 100%=21.
4. We know, that x% equals 17.05 of the output value, so we can write it down as x%=17.05.
5. Now we have two simple equations:
1) 100%=21
2) x%=17.05
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%=21/17.05
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 17.05 is what percent of 21

100%/x%=21/17.05
(100/x)*x=(21/17.05)*x       - we multiply both sides of the equation by x
100=1.2316715542522*x       - we divide both sides of the equation by (1.2316715542522) to get x
100/1.2316715542522=x
81.190476190476=x
x=81.190476190476

now we have:
17.05 is 81.190476190476% of 21