# Definitions for: Ratio

[n] the relative magnitudes of two quantities (usually expressed as a quotient)

Webster (1913) Definition: Ra"ti*o, n. [L., fr. reri, ratus, to reckon, believe,
think, judge. See Reason.]
1. (Math.) The relation which one quantity or magnitude has
to another of the same kind. It is expressed by the
quotient of the division of the first by the second; thus,
the ratio of 3 to 6 is expressed by 3/6 or 1/2; of a to b
by a/b; or (less commonly) the second is made the
dividend; as, a:b = b/a.

Note: Some writers consider ratio as the quotient itself,
making ratio equivalent to a number. The term ratio is
also sometimes applied to the difference of two
quantities as well as to their quotient, in which case
the former is called arithmetical ratio, the latter,
geometrical ratio. The name ratio is sometimes given to
the rule of three in arithmetic. See under Rule.

2. Hence, fixed relation of number, quantity, or degree;
rate; proportion; as, the ratio of representation in
Congress.

Compound ratio, Duplicate ratio, Inverse ratio, etc.
See under Compound, Duplicate, etc.

Ratio of a geometrical progression, the constant quantity
by which each term is multiplied to produce the succeeding
one.

See Also: abundance, albedo, aspect ratio, betting odds, breadth index, cephalic index, cranial index, eccentricity, efficiency, f number, facial index, factor of safety, focal ratio, frequency, fuel consumption, gross margin, haematocrit, hematocrit, I.Q., index of refraction, intelligence quotient, IQ, load factor, loading, loss ratio, Mach number, magnification, magnitude, magnitude relation, margin of profit, mechanical advantage, mileage, miles per gallon, odds, order of magnitude, output-to-input ratio, P/E ratio, packed cell volume, prevalence, price-to-earnings ratio, productivity, profit margin, quantitative relation, quotient, reflective power, refractive index, relative frequency, relative humidity, respiratory quotient, S/N, safety factor, signal/noise, signal/noise ratio, signal-to-noise, signal-to-noise ratio, speed, stoichiometry, stop number, time constant, turnover, turnover rate

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