Math Problem Statement

The surface areas of two similar figures are given. S.A=192 sq meters, S.A.=1728 sq meters and V=4860 cubic meters. Find the volume of the smaller figure. Type your answers here for 1, 2, 3.

  1. Use the surface areas to find the scale factor.

  2. What is the volume ratio?

3. Use the volume ratio to find the smaller volume.

Solution

Let’s solve the problem step by step:


1. Use the surface areas to find the scale factor.

The surface area of similar figures is proportional to the square of the scale factor (k2k^2):

Surface Area of Smaller FigureSurface Area of Larger Figure=k21.\frac{\text{Surface Area of Smaller Figure}}{\text{Surface Area of Larger Figure}} = \frac{k^2}{1}.

Substitute the given surface areas:

1921728=k2.\frac{192}{1728} = k^2.

Simplify:

k2=1921728=19.k^2 = \frac{192}{1728} = \frac{1}{9}.

Thus, the scale factor (kk) is:

k=19=13.k = \sqrt{\frac{1}{9}} = \frac{1}{3}.


2. What is the volume ratio?

The volume ratio is proportional to the cube of the scale factor (k3k^3):

Volume Ratio=k3.\text{Volume Ratio} = k^3.

Since k=13k = \frac{1}{3}:

k3=(13)3=127.k^3 = \left(\frac{1}{3}\right)^3 = \frac{1}{27}.

Thus, the volume ratio is:

127.\frac{1}{27}.


3. Use the volume ratio to find the smaller volume.

The volumes are proportional according to the volume ratio:

Volume of Smaller FigureVolume of Larger Figure=127.\frac{\text{Volume of Smaller Figure}}{\text{Volume of Larger Figure}} = \frac{1}{27}.

Let VsmallV_{\text{small}} be the volume of the smaller figure and substitute the larger volume (Vlarge=4860V_{\text{large}} = 4860):

Vsmall4860=127.\frac{V_{\text{small}}}{4860} = \frac{1}{27}.

Solve for VsmallV_{\text{small}}:

Vsmall=4860×127.V_{\text{small}} = 4860 \times \frac{1}{27}.

Simplify:

Vsmall=180cubic meters.V_{\text{small}} = 180 \, \text{cubic meters}.


Final Answers:

  1. Scale factor: 13\frac{1}{3}.
  2. Volume ratio: 127\frac{1}{27}.
  3. Volume of the smaller figure: 180cubic meters180 \, \text{cubic meters}.

Would you like additional details or clarification?
Here are 5 related questions:

  1. How are scale factor calculations affected by units?
  2. What if the surface areas were given in different units—how would that change the solution?
  3. How does this calculation relate to real-world applications like scaling down models?
  4. Can the same method be applied to irregular shapes if they are similar?
  5. Why does the volume scale by the cube of the scale factor?

Tip: Always double-check units when solving ratio problems involving geometry. Misaligned units can lead to incorrect results.

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Math Problem Analysis

Mathematical Concepts

Geometry
Ratios and Proportions
Scaling of Similar Figures

Formulas

Surface Area Ratio = (Scale Factor)^2
Volume Ratio = (Scale Factor)^3
Volume of Smaller Figure = Volume of Larger Figure × Volume Ratio

Theorems

Scaling Theorem for Similar Figures

Suitable Grade Level

Grades 8-10