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Finding the Fourth Proportional to 748.04, 1,120.32 and 381.92

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Solution

The fourth proportional to 748.04, 1,120.32 and 381.92 is: 571.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.04 : 1,120.32 = 381.92 : x
  2. Step 2: Convert to fraction form
    748.04/1,120.32 = 381.92/x
  3. Step 3: Cross multiply
    748.04x = 1,120.32 × 381.92
  4. Step 4: Simplify right side
    748.04x = 427,872.61
  5. Step 5: Solve for x
    x = 427,872.61/748.04
  6. Step 6: Final answer
    x = 571.99

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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.