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Finding the Fourth Proportional to 129.11, 193.31 and 106.38

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Solution

The fourth proportional to 129.11, 193.31 and 106.38 is: 159.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.11 : 193.31 = 106.38 : x
  2. Step 2: Convert to fraction form
    129.11/193.31 = 106.38/x
  3. Step 3: Cross multiply
    129.11x = 193.31 × 106.38
  4. Step 4: Simplify right side
    129.11x = 20,564.78
  5. Step 5: Solve for x
    x = 20,564.78/129.11
  6. Step 6: Final answer
    x = 159.29

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.