Question

If $\text{a:b::c:d}$, then $\text{a and d}$ are called _____ while $\text{b and c}$ are called _____

• A. extreme terms
• B. middle or means terms

Answer 1

$\text{a:b::c:d}$ is in proportion,

Therefore, $\text{Product of extremes terms = Product of means terms}$,

The first and last terms are called extremes terms, while the second and third terms are called middle or means terms.

Therefore, $\text{a and d}$ are called extremes terms

$\text{b and c}$ are called middle or means terms