Both Uses of

proportion
in
Northanger Abbey

She saw a large, well-proportioned apartment, an handsome dimity bed, arranged as unoccupied with an housemaid's care, a bright Bath stove, mahogany wardrobes, and neatly painted chairs, on which the warm beams of a western sun gaily poured through two sash windows!†
Chpt 24 *

proportioned = made appropriate in size, amount, or degree

The room in question was of a commodious, well-proportioned size, and handsomely fitted up as a dining-parlour; and on their quitting it to walk round the grounds, she was shown, first into a smaller apartment, belonging peculiarly to the master of the house, and made unusually tidy on the occasion; and afterwards into what was to be the drawing-room, with the appearance of which, though unfurnished, Catherine was delighted enough even to satisfy the general.†
Chpt 26

Definitions:

(1) (proportion as in: the proportion of females)
relative amount, quantity, or collection
The 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