As adjectives the difference between proportional and proportionable
is that proportional
is at a constant ratio (to) two magnitudes (numbers) are said to be proportional if the second varies in a direct relation arithmetically to the first while proportionable
is capable of being proportioned, or made proportional.
Other Comparisons: What's the difference?
At a constant ratio (to). Two magnitudes (numbers) are said to be proportional if the second varies in a direct relation arithmetically to the first.
:* The stopping distance is proportional to the square of the speed of the vehicle. —
"How Far Will It Skid" at physicsclassroom.com.
In proportion (to), proportionate. More common in US than UK.
:* ...how much of the Bush administration's immediate post-9/11 emphasis on Iraq was appropriate and proportional to the overall picture of terrorism — retrieved 24 Jan 2005.
Capable of being proportioned, or made proportional.