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Finding the Fourth Proportional to 129.27, 178.02 and 113.93

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Solution

The fourth proportional to 129.27, 178.02 and 113.93 is: 156.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.27 : 178.02 = 113.93 : x
  2. Step 2: Convert to fraction form
    129.27/178.02 = 113.93/x
  3. Step 3: Cross multiply
    129.27x = 178.02 × 113.93
  4. Step 4: Simplify right side
    129.27x = 20,281.82
  5. Step 5: Solve for x
    x = 20,281.82/129.27
  6. Step 6: Final answer
    x = 156.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.