Major fourth and minor fifth

Wyschnegradsky considered it a good approximation of the eleventh harmonic[1] (11:8 or 551.32 cents).

[2] A narrower undecimal major fourth is found at 537 cents (the ratio 15:11).

31 equal temperament has an interval of 542 cents, which lies in between the two types of undecimal major fourth.

The term may also be applied to the ratio 64:45 (G♭-) or 609.77 cents (Playⓘ), formed from the perfect fourth (4/3 = 498.04) and the major semitone (16/15 = 111.73),[3] which is sharp of the G♭ tritone.

The term major fourth may also be applied to the follow, as minor fifth may be applied to their inversions (in the sense of augmented and diminished): This music theory article is a stub.