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Finding the Fourth Proportional to 748.38, 1,122.21 and 423.66

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Solution

The fourth proportional to 748.38, 1,122.21 and 423.66 is: 635.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.38 : 1,122.21 = 423.66 : x
  2. Step 2: Convert to fraction form
    748.38/1,122.21 = 423.66/x
  3. Step 3: Cross multiply
    748.38x = 1,122.21 × 423.66
  4. Step 4: Simplify right side
    748.38x = 475,435.49
  5. Step 5: Solve for x
    x = 475,435.49/748.38
  6. Step 6: Final answer
    x = 635.29

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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.