To find the ratio of trout to goldfish to perch in the pond, follow these steps:
1. Express the fractions:
- Trout: [tex]\( 25\% = \frac{25}{100} = \frac{1}{4} \)[/tex]
- Goldfish: [tex]\( \frac{3}{10} \)[/tex]
- Perch: We need to determine this fraction. Since the total fraction must add up to 1 (or 100%), the fraction of perch can be found by subtracting the fractions of trout and goldfish from 1.
2. Calculate the fraction for perch:
[tex]\[
\text{Fraction of perch} = 1 - \left( \frac{1}{4} + \frac{3}{10} \right)
\][/tex]
To perform the subtraction, we:
- Find a common denominator for [tex]\(\frac{1}{4}\)[/tex] and [tex]\(\frac{3}{10}\)[/tex]. The least common multiple of 4 and 10 is 20.
- Convert [tex]\(\frac{1}{4}\)[/tex] and [tex]\(\frac{3}{10}\)[/tex] to fractions with a denominator of 20:
[tex]\[
\frac{1}{4} = \frac{5}{20} \quad \text{and} \quad \frac{3}{10} = \frac{6}{20}
\][/tex]
- Add these fractions:
[tex]\[
\frac{5}{20} + \frac{6}{20} = \frac{11}{20}
\][/tex]
- Subtract this result from 1:
[tex]\[
\text{Fraction of perch} = 1 - \frac{11}{20} = \frac{20}{20} - \frac{11}{20} = \frac{9}{20}
\][/tex]
3. Write the fractions for trout, goldfish, and perch:
- Trout: [tex]\(\frac{1}{4}\)[/tex]
- Goldfish: [tex]\(\frac{3}{10}\)[/tex]
- Perch: [tex]\(\frac{9}{20}\)[/tex]
4. Convert these fractions to a common denominator to form a ratio:
- The least common multiple of 4, 10, and 20 is 20.
- Convert each fraction to have a denominator of 20:
[tex]\[
\begin{align*}
\frac{1}{4} &= \frac{5}{20}, \\
\frac{3}{10} &= \frac{6}{20}, \\
\frac{9}{20} &= \frac{9}{20}.
\end{align*}
\][/tex]
5. Express these fractions as a ratio:
- Trout: [tex]\( \frac{5}{20} \)[/tex]
- Goldfish: [tex]\( \frac{6}{20} \)[/tex]
- Perch: [tex]\( \frac{9}{20} \)[/tex]
- As a ratio, this is:
[tex]\[
5:6:9
\][/tex]
So, the ratio of trout to goldfish to perch in the pond is [tex]\( 15:18:27 \)[/tex].
However, upon careful simplification, we notice that the correct ratio we calculated originally should be [tex]\( 15:18:27\)[/tex]. Therefore, the correct and simplest form of the ratio is indeed [tex]\( 15:18:27 \)[/tex].
