There were 387 co-pros, just like the 287s (ad 8087s). You could actually use a 287 to provide floating-point instructions to a 386, albeit more slowly than a 387.

Very little, if any, “home” or small-business software would make use of a floating-point unit though (maybe some spreadsheet apps did?). The most common use for them was CAD/CAM, and those doing scientific modelling without a budget that would allow for less consumer-grade kit.