Figure a 27.5ft 27.5ft 55ft

To determine if the two figures are similar and to find the volume ratio, let's calculate the volumes of both figures.

### Volume Calculation

1. **Figure A: Dimensions = 27.5ft x 27.5ft x 55ft**
- Volume of Figure A = Length × Width × Height
\[
V_A = 27.5 \times 27.5 \times 55
\]
- Calculating it:
\[
V_A = 27.5^2 \times 55 = 756.25 \times 55 = 41593.75 \text{ cubic feet}
\]

2. **Figure B: Dimensions = 5.5ft x 5.5ft x 11ft**
- Volume of Figure B = Length × Width × Height
\[
V_B = 5.5 \times 5.5 \times 11
\]
- Calculating it:
\[
V_B = 5.5^2 \times 11 = 30.25 \times 11 = 332.75 \text{ cubic feet}
\]

### Ratio of Volumes
Next, we will find the ratio of the volumes \(V_A\) to \(V_B\):
\[
\text{Ratio} = \frac{V_A}{V_B} = \frac{41593.75}{332.75} \approx 125:1
\]

### Determine Similarity
To check the similarity:
- The ratio of the lengths of corresponding sides between the figures is:
\[
\text{Side Ratio} = \frac{27.5}{5.5} = 5
\]
Thus, because the lengths share the same ratios, the figures are similar in shape.

### Conclusion
The correct statement based on the calculations is:
**The two figures are similar because the volumes have a ratio of 125 : 1.**