Europe dwarfs Madagascar: about 10,180,000 km² km² against 594,622 km² km². At true size Europe is about 17.1× larger — the whole of Madagascar fits into Europe roughly 17 times.
The old Mercator map treated both about equally (1× vs 1.1× inflation), so at least their relative sizes were preserved — even if both were drawn at the wrong absolute scale.
Madagascar fits 17× into Europe.