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Finding the Fourth Proportional to 311.92, 431.04 and 229.12

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Solution

The fourth proportional to 311.92, 431.04 and 229.12 is: 316.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.92 : 431.04 = 229.12 : x
  2. Step 2: Convert to fraction form
    311.92/431.04 = 229.12/x
  3. Step 3: Cross multiply
    311.92x = 431.04 × 229.12
  4. Step 4: Simplify right side
    311.92x = 98,759.88
  5. Step 5: Solve for x
    x = 98,759.88/311.92
  6. Step 6: Final answer
    x = 316.62

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.