To find the ratio of apples to plums in the fruit basket, we can use the quantities given: there are 4 apples and 3 plums.
The simplest way to express the relationship between apples and plums is to frame it as a ratio.
The ratio of apples to plums can be expressed as:
\[ \text{Ratio of apples to plums} = \frac{4 \text{ apples}}{3 \text{ plums}} = 4:3 \]
So, you can fill in the blanks as follows:
For every 4 apples, there are 3 plums.