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If you have one ratio then multiply both numbers of the ratio, x:y (or x/y), by any non-zero number. You will have an equivalent ratio.
Unbalanced relation,
A 'ratio' shows a relationship between two numbers. There's no such thing as the ratio of one single number.
The cardinality ratio specifies the number of relationship instances that an entity can participate in.
A rational number is one which can be expressed as a ratio of two integers.