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Finding the Fourth Proportional to 381.89, 572.87 and 219.42

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Solution

The fourth proportional to 381.89, 572.87 and 219.42 is: 329.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.89 : 572.87 = 219.42 : x
  2. Step 2: Convert to fraction form
    381.89/572.87 = 219.42/x
  3. Step 3: Cross multiply
    381.89x = 572.87 × 219.42
  4. Step 4: Simplify right side
    381.89x = 125,699.68
  5. Step 5: Solve for x
    x = 125,699.68/381.89
  6. Step 6: Final answer
    x = 329.15

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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.