What is 2 thirds to the fourth power?

To calculate ( \left(\frac{2}{3}\right)^4 ), you raise both the numerator and the denominator to the fourth power. This results in ( \frac{2^4}{3^4} = \frac{16}{81} ). Thus, ( \left(\frac{2}{3}\right)^4 = \frac{16}{81} ).