Question

Which of the following statements correctly defines a proportion involving four non-zero quantities a, b, c, and d?

Options

• a : d :: b : c

• a + b = c + d

• a − b = c − d

• a × b = c × d

Answer 1

a : d :: b : c

Explanation:

A proportion is defined as the equality of two ratios. The notation '::' represents the equality, meaning the ratio of a to b is equal to the ratio of c to d.