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Finding the Fourth Proportional to 129.61, 176.47 and 129.21

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Solution

The fourth proportional to 129.61, 176.47 and 129.21 is: 175.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.61 : 176.47 = 129.21 : x
  2. Step 2: Convert to fraction form
    129.61/176.47 = 129.21/x
  3. Step 3: Cross multiply
    129.61x = 176.47 × 129.21
  4. Step 4: Simplify right side
    129.61x = 22,800.70
  5. Step 5: Solve for x
    x = 22,800.70/129.61
  6. Step 6: Final answer
    x = 175.92

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.