Name | Formula | Solution | Mean of octave (2/1) |
Arithmetic | a − b = b − c | b = (a + c)/2 | B = 3/2 (perfect fifth) |
Geometric | a/b = b/c | b = | b = (tritone) |
Harmonic | (a − b)/a = (b − c)/c | b = 2ac/(a + c) | b = 4/3 (perfect fourth) |