Voltage has nothing to with frequency
I know that a company named TEMco makes a 380v to 120/208 transformer. You can try contacting them for your specific application I will attach their website for you.
No, the voltage of 500 volts is too high to operate a 380 volt motor.
Yes, But in this case the current will rise up by about 15% at full load. So if you will use the motor to drive any mechanical load take in your consideration the mechanical load Power (KW) must not exceed 85% of motor power (KW)
Saudi Arabia uses both 127 V and 220 V, although the 220 V is more commonly used.
380
84% of 380 = 84% * 380 = 0.84 * 380 = 319.2
15% of 380= 15% * 380= 0.15 * 380= 57
1% of 380= 1% * 380= 0.01 * 380= 3.8
380
40% of $380= 40% * 380= 0.4 * 380= $152
38000%380= 380 * 100%= 38000%
380 in a percentage = 38000%380 * 100% = 38000%