# perfect fourth

> musical interval spanning four staff positions and five semitones, with a frequency ratio of approximately 4:3=1.333… (in equal temperament, ¹²√2⁵ = 1.335…)

**Wikidata**: [Q15028629](https://www.wikidata.org/wiki/Q15028629)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Perfect_fourth)  
**Source**: https://4ort.xyz/entity/perfect-fourth