This word is about how correct, attractive, or suitable something is in its size and shape — a body, a room, a building, a vase. You almost always meet it with well- or beautifully in front: a well-proportioned house; a beautifully proportioned face. Ill-proportioned exists too, for a shape that looks off. It is not the maths word. Though actually it does not mean “in proportion to some other changing amount.” It means the parts of this one thing sit well together. People who write about clothes, faces, and buildings like it. In daily talk, you more often hear in good shape or the rooms feel right.