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Finding the Fourth Proportional to 284.20, 391.92 and 229.12

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Solution

The fourth proportional to 284.20, 391.92 and 229.12 is: 315.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.20 : 391.92 = 229.12 : x
  2. Step 2: Convert to fraction form
    284.20/391.92 = 229.12/x
  3. Step 3: Cross multiply
    284.20x = 391.92 × 229.12
  4. Step 4: Simplify right side
    284.20x = 89,796.71
  5. Step 5: Solve for x
    x = 89,796.71/284.20
  6. Step 6: Final answer
    x = 315.96

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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.