The Only Use of
proportion
in
To Kill a Mockingbird
 Maycomb's proportion of professional people ran high: one went there to have his teeth pulled, his wagon fixed, his heart listened to, his money deposited, his soul saved, his mules vetted.
p. 148.7proportion = share or percentage
Definitions:

(1)
(proportion as in: the proportion of females) relative amount, quantity, or collectionThe exact meaning of this sense of proportion is subject to its context. For example:
 "The female proportion is 50%."  percentage or share
 "The proportion of oil to vinegar."  ratio (quantity of something relative to the quantity of something else)
 "In the survey, the female proportion said..."  group

(2)
(proportion as in: a problem of large proportion) size or dimension

(3)
(proportion as in: respond in proportion) appropriate in size, amount, or degree