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Finding the Fourth Proportional to 311.90, 467.64 and 129.24

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Solution

The fourth proportional to 311.90, 467.64 and 129.24 is: 193.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.90 : 467.64 = 129.24 : x
  2. Step 2: Convert to fraction form
    311.90/467.64 = 129.24/x
  3. Step 3: Cross multiply
    311.90x = 467.64 × 129.24
  4. Step 4: Simplify right side
    311.90x = 60,437.79
  5. Step 5: Solve for x
    x = 60,437.79/311.90
  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.