What is 17.21 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 21 is 100%, so we can write it down as 21=100%.
4. We know, that x is 17.21% of the output value, so we can write it down as x=17.21%.
5. Now we have two simple equations:
1) 21=100%
2) x=17.21%
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:
21/x=100%/17.21%
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for what is 17.21% of 21

21/x=100/17.21
(21/x)*x=(100/17.21)*x       - we multiply both sides of the equation by x
21=5.8105752469494*x       - we divide both sides of the equation by (5.8105752469494) to get x
21/5.8105752469494=x
3.6141=x
x=3.6141

now we have:
17.21% of 21=3.6141