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Finding the Fourth Proportional to 144.72, 217.49 and 129.87

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Solution

The fourth proportional to 144.72, 217.49 and 129.87 is: 195.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.72 : 217.49 = 129.87 : x
  2. Step 2: Convert to fraction form
    144.72/217.49 = 129.87/x
  3. Step 3: Cross multiply
    144.72x = 217.49 × 129.87
  4. Step 4: Simplify right side
    144.72x = 28,244.78
  5. Step 5: Solve for x
    x = 28,244.78/144.72
  6. Step 6: Final answer
    x = 195.17

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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.