Final answer:
To convert the ratio 1: 3/7 to a fraction, you multiply 1 by the reciprocal of 3/7, resulting in 7/3, which is in its lowest terms.
Step-by-step explanation:
When we have a ratio like 1: 3/7, it can also be represented as the fraction 1 / (3/7).
To simplify this, we need to divide 1 by 3/7.
To do this, we multiply 1 by the reciprocal of 3/7, which is 7/3, leading to the calculation 1 * (7/3).
This results in 7/3, which is already in its lowest terms, so the answer to the question is 7/3.