If I look at Hooke's law as it's defined in my textbook, it looks like:
$F = -k\Delta s$
Therefore, the restoring force of an ideal spring will be proportional to the displacement from equilibrium, where $k$ will be the constant of proportionality. From this equation, I believe that it can't be said that mass is proportional to the displacement from equilibrium (even though it seems to be the case implicitly).
However, if I substitute $ma$ for the restoring force:
$ma = -k\Delta s$
Is it then valid to say that mass is proportional to the displacement from equilibrium, as well as mass is inversely proportional to acceleration? I've been thinking about proportionality a lot lately and this one sort of threw me for a loop.