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Interval information
JI glyph Perfect fourth.png
Ratio 4/3
Monzo |2 -1>
Size in cents 498.04500
Name(s) just perfect fourth
Color name w4, wa 4th

[sound info]

4/3 is the frequency ratio of the just perfect fourth. Its inversion is the perfect fifth, 3/2.

See also Perfect fourth (Wikipedia)