The phrase "is a ratio" is grammatically correct and can be used in written English.
Example: The formula for calculating the area of a rectangle is length times width, which is a ratio between the two dimensions.
It is a ratio that even corrections officials lament.
That is a ratio of 5.4 to 1.
(That figure is a ratio of the building's net operating income relative to the sales price).
Since it is a ratio, specific gravity has no units.
In other words, it is a ratio without units.
Carney says: Capital ratio is a ratio of the equity in an institution relative to the assets.
However the apparent rapid rise is a ratio, and might not necessarily indicate that old devices are being updated.
The debt burden is a ratio between the accumulated debt and the GDP, both expressed in nominal terms.
Safety, he said, is a ratio of benefit to risk, and when it comes to implants, few agree on benefits.
It is a ratio that can flummox, particularly during a rainstorm at rush hour.
It is a ratio that no other large nation has approached in modern times.
