128/99
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| Ratio | 128/99 |
| Factorization | 27 × 3-2 × 11-1 |
| Monzo | [7 -2 0 0 -1⟩ |
| Size in cents | 444.77206¢ |
| Names | undecimal subfourth, undecimal minor fourth, Alpharabian paraminor fourth, just paraminor fourth |
| Color name | 1u4, lu 4th |
| FJS name | [math]\text{P4}_{11}[/math] |
| Special properties | reduced |
| Tenney height (log2 nd) | 13.6294 |
| Weil height (log2 max(n, d)) | 14 |
| Wilson height (sopfr (nd)) | 31 |
| Harmonic entropy (Shannon, [math]\sqrt{n\cdot d}[/math]) |
~4.57789 bits |
| 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 undecimal 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.
Approximation
This interval is especially close to the 10th step of 27edo.