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Finding the Fourth Proportional to 266.57, 399.56 and 129.31

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Solution

The fourth proportional to 266.57, 399.56 and 129.31 is: 193.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.57 : 399.56 = 129.31 : x
  2. Step 2: Convert to fraction form
    266.57/399.56 = 129.31/x
  3. Step 3: Cross multiply
    266.57x = 399.56 × 129.31
  4. Step 4: Simplify right side
    266.57x = 51,665.11
  5. Step 5: Solve for x
    x = 51,665.11/266.57
  6. Step 6: Final answer
    x = 193.82

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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.