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Finding the Fourth Proportional to 311.92, 467.93 and 129.21

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Solution

The fourth proportional to 311.92, 467.93 and 129.21 is: 193.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.92 : 467.93 = 129.21 : x
  2. Step 2: Convert to fraction form
    311.92/467.93 = 129.21/x
  3. Step 3: Cross multiply
    311.92x = 467.93 × 129.21
  4. Step 4: Simplify right side
    311.92x = 60,461.24
  5. Step 5: Solve for x
    x = 60,461.24/311.92
  6. Step 6: Final answer
    x = 193.84

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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.