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We are given two ratios in this problem:

1. The ratio of dolphins to pufferfish is 2:3.
2. The ratio of pufferfish to starfish is 4:7.

We also know there are 8 dolphins in the aquarium. The goal is to find how many starfish there are.

### Step-by-step solution:

1. **Find the number of pufferfish**:
   From the first ratio (dolphins : pufferfish = 2:3), we know:
   \[
   \frac{\text{dolphins}}{\text{pufferfish}} = \frac{2}{3}.
   \]
   Since there are 8 dolphins, set up the proportion:
   \[
   \frac{8}{x} = \frac{2}{3},
   \]
   where \(x\) is the number of pufferfish.

   Solving for \(x\):
   \[
   8 \cdot 3 = 2 \cdot x \implies 24 = 2x \implies x = \frac{24}{2} = 12.
   \]
   So, there are 12 pufferfish.

2. **Find the number of starfish**:
   Now use the second ratio (pufferfish : starfish = 4:7), which gives:
   \[
   \frac{\text{pufferfish}}{\text{starfish}} = \frac{4}{7}.
   \]
   Since we know there are 12 pufferfish, set up the proportion:
   \[
   \frac{12}{y} = \frac{4}{7},
   \]
   where \(y\) is the number of starfish.

   Solving for \(y\):
   \[
   12 \cdot 7 = 4 \cdot y \implies 84 = 4y \implies y = \frac{84}{4} = 21.
   \]
   So, there are 21 starfish.

### Final Answer:
There are 21 starfish in the aquarium.

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Would you like any further details on this solution or have any questions? 

Here are 5 related questions to consider:
1. What if there were 10 dolphins in the aquarium instead of 8?
2. How would the number of starfish change if the ratio of pufferfish to starfish was 5:7?
3. Can you calculate the total number of animals in the aquarium?
4. What would be the number of starfish if there were 16 dolphins?
5. How do we solve similar ratio problems with three or more groups?

**Tip**: Always express ratios as fractions to easily set up proportions for solving problems.

In an aquarium, the ratio of dolphins to pufferfish is 2:3 and the ratio of pufferfish to starfish is 4:7. There are 8 dolphins in the aquarium. How many starfish are there?

Learn how to solve a ratio problem involving dolphins, pufferfish, and starfish in an aquarium. Given ratios between the animals, determine the number of starfish when there are 8 dolphins. This problem is suitable for students in Grades 6-8 and covers key concepts in ratios and proportions.

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