Final answer:
The first and last terms in a proportion are called extremes.
Step-by-step explanation:
The first and last terms in a proportion are called extremes. In a proportion, the first term is usually referred to as the antecedent, and the last term is called the consequent. The antecedent is the value that precedes the colon (:) or equal sign (=), and the consequent is the value that follows it.
Learn more about Proportions in mathematics