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Finding the Fourth Proportional to 229.13, 316.20 and 129.55

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Solution

The fourth proportional to 229.13, 316.20 and 129.55 is: 178.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    229.13 : 316.20 = 129.55 : x
  2. Step 2: Convert to fraction form
    229.13/316.20 = 129.55/x
  3. Step 3: Cross multiply
    229.13x = 316.20 × 129.55
  4. Step 4: Simplify right side
    229.13x = 40,963.71
  5. Step 5: Solve for x
    x = 40,963.71/229.13
  6. Step 6: Final answer
    x = 178.78

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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.