why are you multiplying by 4/3 and then 1/2? my number isn't right but neither is yours, i just spammed the decimal places for the hell of it. it's 142.5 bpm, divide 190 bpm by 4 because it's in 1/4th, then multiply by 3 to put it in 1/3rd.
yeah i think i meant to divide by 4/3 not multiply. 190 * 3/4 = 142.5