another way to tell is to see if they are equivalent...because proportions are nothing but equivalent fractions. 12/30 = 2/5 18/45 = 2/5 so yes, they are proportional
12/30 = 18/45, so first you're going to cross multiply and you'll get (30)(18) = (12)(45). Then you can see that 540 = 540 same number so they're proportional...
BTW THIS WAY IS A LOT EASIER.
12/30 = 2/5
18/45 = 2/5
So yes, in summary, they're proportional to each other. Hope this helps, have a BLESSED and wonderful day! :-)