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Finding the Fourth Proportional to 217.20, 299.73 and 129.87

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Solution

The fourth proportional to 217.20, 299.73 and 129.87 is: 179.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.20 : 299.73 = 129.87 : x
  2. Step 2: Convert to fraction form
    217.20/299.73 = 129.87/x
  3. Step 3: Cross multiply
    217.20x = 299.73 × 129.87
  4. Step 4: Simplify right side
    217.20x = 38,925.94
  5. Step 5: Solve for x
    x = 38,925.94/217.20
  6. Step 6: Final answer
    x = 179.22

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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.