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Finding the Fourth Proportional to 312.11, 467.76 and 129.30

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Solution

The fourth proportional to 312.11, 467.76 and 129.30 is: 193.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.11 : 467.76 = 129.30 : x
  2. Step 2: Convert to fraction form
    312.11/467.76 = 129.30/x
  3. Step 3: Cross multiply
    312.11x = 467.76 × 129.30
  4. Step 4: Simplify right side
    312.11x = 60,481.37
  5. Step 5: Solve for x
    x = 60,481.37/312.11
  6. Step 6: Final answer
    x = 193.78

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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.