On River we have 3 Value Hands and 1 bluff. ( 3:1) Ratio.
Villian has only a bluff catcher.

I'm i correct in assuming we should bet 50% of the pot. Therefore Villian gets 3:1 odds on a call, therefore zero ev when he 75% of the time, as are value/bluff ratio is 3:1. His Maximum Ev=0
and If i bet Pot and he calls 67% of the time I lose money as i would need 2:1 Value to bluff combos for his Ev to be zero given he calls ??
And if i was to be 1/4 Pot i would and he called 83% of the time i would lose money as i would need a 5:1 bluff/value ratio?