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Finding the Fourth Proportional to 115.28, 171.85 and 106.64

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Solution

The fourth proportional to 115.28, 171.85 and 106.64 is: 158.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.28 : 171.85 = 106.64 : x
  2. Step 2: Convert to fraction form
    115.28/171.85 = 106.64/x
  3. Step 3: Cross multiply
    115.28x = 171.85 × 106.64
  4. Step 4: Simplify right side
    115.28x = 18,326.08
  5. Step 5: Solve for x
    x = 18,326.08/115.28
  6. Step 6: Final answer
    x = 158.97

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.