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Finding the Fourth Proportional to 411.92, 617.96 and 219.76

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Solution

The fourth proportional to 411.92, 617.96 and 219.76 is: 329.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.92 : 617.96 = 219.76 : x
  2. Step 2: Convert to fraction form
    411.92/617.96 = 219.76/x
  3. Step 3: Cross multiply
    411.92x = 617.96 × 219.76
  4. Step 4: Simplify right side
    411.92x = 135,802.89
  5. Step 5: Solve for x
    x = 135,802.89/411.92
  6. Step 6: Final answer
    x = 329.68

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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.