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Finding the Fourth Proportional to 381.43, 572.11 and 107.53

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Solution

The fourth proportional to 381.43, 572.11 and 107.53 is: 161.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.43 : 572.11 = 107.53 : x
  2. Step 2: Convert to fraction form
    381.43/572.11 = 107.53/x
  3. Step 3: Cross multiply
    381.43x = 572.11 × 107.53
  4. Step 4: Simplify right side
    381.43x = 61,517.89
  5. Step 5: Solve for x
    x = 61,517.89/381.43
  6. Step 6: Final answer
    x = 161.28

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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.