Changing PSI when going from 3/4 pipe to 1 inch

[tjcooper]

This is probably simple. I have a 3/4 pipe fitted to a 1 inch pipe. I want the PSI at the 1 inch pipe to be 50. Does the PSI at the 3/4 need to be 62.5 (simple ratio conversion).

Ive been out of school too long.