A constant ratio is a number or term which is constantly used (either added/subtracted or multiplied/divided) throughout a geometric sequence.
E.g. 4;-8;16;-32;64;...
the constant ratio is ×(-2); multiply each term by -2 starting with 4
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It is the constant of proportionality or the conversion factor.
direct square variation is a function that relates the same or equal constant ratio. It is a function that is typically used in different kinds of algebra.
Ratio
Constant is a number with no variables. For an example, 12a, but this is a constant 12.
The relationship is a linear one. For example when driving at a constant speed, the relationship between distance driven and the time driven is linear with a constant ratio (of the constant speed).