Description
Calculate a missing ratio part from a known part and known-to-missing ratio.
Proportions depend on the order of a ratio, its denominator and whether an input is a decimal fraction or a percentage number. Inverting a zero-crossing interval is undefined, and rounding an ideal share to a quantum can exceed a total. Supplied conservation, tax or mixing assumptions need explicit units and boundaries before interpretation.
Calculate a missing ratio part from a known part and known-to-missing ratio.
When to use this tool
Use Target Ratio Missing Part when you already have knownPart, suppliedKnownToMissingRatio and need to calculate a missing ratio part from a known part and known-to-missing ratio.
How to use the tool and how it works
- Enter knownPart, suppliedKnownToMissingRatio. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read missingPart. Use the output convention below.
Require knownPart>=0 and ratio>0; return knownPart/suppliedKnownToMissingRatio.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| knownPart | Known Part | Required. Finite number; minimum 0. |
| suppliedKnownToMissingRatio | Positive known part/missing part, so missing=known/ratio. | Required. Finite number; strictly above 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| missingPart | Missing Part | Required. Finite number. |
{
"input": {
"knownPart": 12,
"suppliedKnownToMissingRatio": 3
},
"output": {
"missingPart": 4
}
}Limitations and assumptions
- The ratio direction is known divided by missing; units and the validity of the assumed proportion are caller responsibilities.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Write the numerator, denominator and ratio direction explicitly before rebasing or inverting a quantity. Use a full allocation or mass balance for multiple components, and account for quantum remainders jointly when rounded shares must add to a fixed total.
References
Similar or alternative tools
- Weighted Share Denominator Rebase
Compare one weighted numerator under two positive denominators.
- Percentage Reduction Remaining Base
Separate a percentage reduction from its remaining original base.