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Finding the Fourth Proportional to 437.78, 656.76 and 129.61

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Solution

The fourth proportional to 437.78, 656.76 and 129.61 is: 194.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    437.78 : 656.76 = 129.61 : x
  2. Step 2: Convert to fraction form
    437.78/656.76 = 129.61/x
  3. Step 3: Cross multiply
    437.78x = 656.76 × 129.61
  4. Step 4: Simplify right side
    437.78x = 85,122.66
  5. Step 5: Solve for x
    x = 85,122.66/437.78
  6. Step 6: Final answer
    x = 194.44

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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.