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Interval information
Ratio 128/99
Monzo [7 -2 0 0 -1
Size in cents 444.77205
Name(s) undecimal subfourth,
minor fourth,
Alpharabian paraminor fourth,
just paraminor fourth
open this interval in xen-calc

In 11-limit just intonation, 128/99 is an undecimal subfourth measuring about 444.8¢. It is the inversion of 99/64, the undecimal superfifth. This interval is also known as the minor fourth through analogy with 11/8 being the "major fourth" as named by Ivan Wyschnegradsky, and can additionally be somewhat similarly dubbed the Alpharabian paraminor fourth or even the just paraminor fourth. It is distinguished from the simpler 22/17 by the twosquare comma.


This interval is especially close to the 10th step of 27edo.

See also