the world > relative properties > order > agreement, harmony, or congruity > suitability or appropriateness > [adjective] > that is in due proportion or proportionate > adjusted in due proportion (4)
As the second element of compounds, as ill-proportioned, perfectly proportioned, etc. (see also well-proportioned, adj.).
Having (specified) proportions; = proportioned, adj.
That has been modulated (in various senses).