±Free
Missing proportion
Solve a / b = c / x for the missing fourth value.
Enter a, b and c in the displayed proportion. Cross multiplication gives x = b × c / a; for a = 2, b = 3 and c = 4, the missing denominator is 6.
How to use
- Enter your text, values, or image.
- Adjust the options and run the tool.
- Copy or download your result.
Worked example
Example input
a: 2 b: 3 c: 4
Example result
{
"x": 6
}Limitations and details
All three inputs must be finite and nonzero; this tool solves only the displayed fourth-position unknown.
Inputs and options
- a
- Number
- b
- Number
- c
- Number
Frequently asked questions
Is this tool free and private?
Yes. All 300 tools are free in this phase. Processing happens in your browser; your input and files are not sent to our servers.