The middle terms, if four different numbers are in proportion are called ______.

Options

A. Antecedents
B. Means
C. Extremes
D. Consequents

Answer

To solve the question, we need to understand the concept of proportions and the terms involved in them.

### Step-by-Step Solution:

1. **Understanding Proportion**: When we say that four numbers \( a, b, c, d \) are in proportion, it means that the ratio of the first two numbers is equal to the ratio of the last two numbers. This can be expressed as:
\[ \frac{a}{b} = \frac{c}{d} \]

2. **Identifying Terms**: In the proportion \( a : b :: c : d \), the first and the last terms \( a \) and \( d \) are called the **extremes**. The middle terms \( b \) and \( c \) are referred to as the **means**.

3. **Conclusion**: Therefore, the middle terms in a proportion involving four different numbers are called **means**.

### Final Answer:
The middle terms, if four different numbers are in proportion, are called **means**.