Final answer:
The missing number to complete the proportion is 12.
Step-by-step explanation:
To complete the proportion, we need to find the number of plants in 2 rows when there are 6 plants in 1 row. A proportion can be set up as follows:
6 plants in 1 row = x plants in 2 rows
To solve for x, we can use the concept of equivalent fractions. Since the number of rows doubles from 1 to 2, we need to double the number of plants as well. Therefore, the missing number is 12.
Learn more about Proportions in Mathematics