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Finding the Fourth Proportional to 381.86, 572.70 and 219.46

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Solution

The fourth proportional to 381.86, 572.70 and 219.46 is: 329.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.86 : 572.70 = 219.46 : x
  2. Step 2: Convert to fraction form
    381.86/572.70 = 219.46/x
  3. Step 3: Cross multiply
    381.86x = 572.70 × 219.46
  4. Step 4: Simplify right side
    381.86x = 125,684.74
  5. Step 5: Solve for x
    x = 125,684.74/381.86
  6. Step 6: Final answer
    x = 329.14

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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.