To express the ratio 5:1 as equal to the ratio 20:4 in fractional notation without simplifying, you can represent both ratios as fractions.
The ratio 5:1 can be written as:
\[ \frac{5}{1} \]
The ratio 20:4 can be written as:
\[ \frac{20}{4} \]
To express that these two ratios are proportional, you can write the following equation:
\[ \frac{5}{1} = \frac{20}{4} \]
This notation shows that the two ratios are equal in fractional form without simplifying.