The phrase "a specific ratio" is correct and usable in written English.
It can be used when referring to a particular proportion or relationship between two quantities.
Example: "In this experiment, we need to maintain a specific ratio of water to salt to achieve the desired outcome."
Alternatives: "a particular ratio" or "a defined ratio".
Unlike last week's leaders' interviews, the audience has been picked not according to the current polls but a specific ratio.
Please note that the font sizes of "EAPS" and the Department name have a specific ratio.
There must be a formula for this: a specific ratio of troubling current events, personal experience and artistic identity, combined with a potential for multiple interpretations.
After removing T cells from the patients, he said, scientists remove nonessential immune cells, resulting in a specific ratio of engineered helper and killer T cells.
It was shown that a specific ratio ENR/DA gave rise to optimum mechanical properties.
Each particle carries the three drugs in a specific ratio that matches the maximum tolerated dose of each drug, and each drug has its own release mechanism.
Results showed that Mn II) oxidation only occurred when the two strains were within a specific ratios range.
The recognition that a WT1 measurement above a highly specific ratio is an unambiguous indicator of relapse enables the implementation of early interventional therapies.
In vertebrates the cytosolic ferritins are composed of H and L subunit types and their assembly in a tissues specific ratio that permits flexibility to adapt to cell needs.
A specific frequency ratio was calculated by dividing the ratio of variant calls/number of all the bases (at a position) by the ratio of variant allele quality sum/quality sum of all bases.
"But what I like is their commitment" to a specific payout ratio in future years.
