Math: golden ratio, first glance

Tutoring math, you see the golden ratio. The tutor mentions it.

There are a few peculiarities that explain the golden ratio’s uniqueness. Let’s call it r. Then for a number x, x/r = x(r-1). r is irrational; an approximation is 1.61803.

For example, 5(0.61803)=3.090; also, 5/1.61803=3.090.

Source:

mathisfun.com