The frequency of the musical note E3 is about 164.81 Hz.

what is the frequency of the note a perfect fifth above E3.

A perfect fifth above a note has a frequency ratio of 3 to 2.

Therefore, we can set the proportion:

164.81 : x = 2 : 3

which gives:

x = 164.81 * 3 : 2

= 247.21

Hence, the perfect fifth above E₃ will have a frequency of 247.21Hz which corresponds to a B₃.