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- Function:
**rationalize***x e* -
Computes the correct result for exact arguments (provided the implementation supports exact rational numbers of unlimited precision); and produces a reasonable answer for inexact arguments when inexact arithmetic is implemented using floating-point.

`Rationalize`

has limited use in implementations lacking exact
(non-integer) rational numbers. The following procedures return a list
of the numerator and denominator.

- Function:
**find-ratio***x e* -
`find-ratio`

returns the list of the*simplest*numerator and denominator whose quotient differs from`x`by no more than`e`.`(find-ratio 3/97 .0001) ⇒ (3 97) (find-ratio 3/97 .001) ⇒ (1 32)`

- Function:
**find-ratio-between***x y* -
`find-ratio-between`

returns the list of the*simplest*numerator and denominator between`x`and`y`.`(find-ratio-between 2/7 3/5) ⇒ (1 2) (find-ratio-between -3/5 -2/7) ⇒ (-1 2)`