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Finding the Fourth Proportional to 169.20, 233.15 and 129.85

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Solution

The fourth proportional to 169.20, 233.15 and 129.85 is: 178.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    169.20 : 233.15 = 129.85 : x
  2. Step 2: Convert to fraction form
    169.20/233.15 = 129.85/x
  3. Step 3: Cross multiply
    169.20x = 233.15 × 129.85
  4. Step 4: Simplify right side
    169.20x = 30,274.53
  5. Step 5: Solve for x
    x = 30,274.53/169.20
  6. Step 6: Final answer
    x = 178.93

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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.