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Finding the Fourth Proportional to 217.31, 299.89 and 129.98

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Solution

The fourth proportional to 217.31, 299.89 and 129.98 is: 179.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.31 : 299.89 = 129.98 : x
  2. Step 2: Convert to fraction form
    217.31/299.89 = 129.98/x
  3. Step 3: Cross multiply
    217.31x = 299.89 × 129.98
  4. Step 4: Simplify right side
    217.31x = 38,979.70
  5. Step 5: Solve for x
    x = 38,979.70/217.31
  6. Step 6: Final answer
    x = 179.37

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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.