Depends on how you define "equal". Both "you are fined $1", and "you are fined 1% of your income" sound like fair stabs at equal to me. Imprisonment deprives you of 100% of your income, so it's more like the latter.
In 2002, Anssi Vanjoki, a former Nokia director, was ordered to pay a fine of 116,000 euros ($103,600) after being caught driving 75km/h in a 50km/h zone on his motorbike.
All that said, I doubt the $103,000 had much effect on Anssi as say $1000 would have on me. I need want to spend that $1000 one day on food or housing. Anssi was making so much, my guess it's sole effect would be on how much his kids inherited.
As for your "banana republic" quip, Finland does this and I'd place them very much as the "not banana republic" end of the spectrum. Famously, this https://www.weforum.org/agenda/2018/06/in-finland-speeding-t... :
All that said, I doubt the $103,000 had much effect on Anssi as say $1000 would have on me. I need want to spend that $1000 one day on food or housing. Anssi was making so much, my guess it's sole effect would be on how much his kids inherited.