Preposition: of

• circumference: Another preoccupation of the Chinese was the evaluation of π , the ratio of the circumference of a circle to its diameter.

• nanny: Safety is paramount at all times and there's always a high ratio of nannies to children.

Converse of object

• calculate: A measure of the relative facet areas allows us to calculate a relative surface energy ratio E 001 / E 111 = 1.4.

• taper: The curves are a function of taper ratio and apply to straight-tapered wings.

• zoom: Quick Zoom feature enables instant switch to a preset zoom ratio with just one touch of a button.

Adjective modifier

• price-earnings: It is the inverse of the price-earnings ratio, with a few refinements.

• isotopic: The density measurements gave no ground for reliance on an unusual isotopic ratio.

• staff/student: The staff/student ratio is on a par with Oxbridge at 1:10 compared with an average 1:17 at many state-funded universities.

• power-to-weight: This is, in effect, a measure of the power-to-weight ratio of the gun and ammunition combination.

Modifies a noun

• spectrometer: There are also two new isotope ratio mass spectrometers for in vivo studies of energy and protein metabolism in patients.

Noun used with modifier

• signal-to-noise: The improvement in image quality is demonstrated in the measured signal-to-noise ratio of flood exposure images.

• contention: A lower port contention ratio will reduce the risk of ports being unavailable.

• likelihood: We report equal error rates on the PolyVar database that are 34 % lower than a baseline Gaussian mixture model likelihood ratio approach.