CSAT (Aptitude)·Key Methods

Simple Ratios — Key Methods

Updated 6 Mar 2026

Key Methods

Fundamental Principle of Proportionality

Ancient Greek Mathematics (Euclid)

While not a legal judgment, the formalization of proportionality by ancient Greek mathematicians, particularly Euclid in his 'Elements', established the axiomatic basis for…

Principle of Unit Consistency in Ratios

Universal Mathematical Convention

This principle dictates that for a ratio to be meaningful and valid, the quantities being compared must either be of the same unit or convertible to the same unit. For example,…