I believe you've misread 2^(5/12) or perhaps your browser did not display it correctly? Anyway, 2 to the power of 5/12 equals 1.3348.. which is very close to 4

I believe you've misread 2^(5/12) or perhaps your browser did not display it correctly? Anyway, 2 to the power of 5/12 equals 1.3348.. which is very close to 4/3 = 1.333..