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Finding the Fourth Proportional to 329.20, 493.90 and 136.76

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Solution

The fourth proportional to 329.20, 493.90 and 136.76 is: 205.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    329.20 : 493.90 = 136.76 : x
  2. Step 2: Convert to fraction form
    329.20/493.90 = 136.76/x
  3. Step 3: Cross multiply
    329.20x = 493.90 × 136.76
  4. Step 4: Simplify right side
    329.20x = 67,545.76
  5. Step 5: Solve for x
    x = 67,545.76/329.20
  6. Step 6: Final answer
    x = 205.18

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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.