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Finding the Fourth Proportional to 748.54, 1,121.26 and 439.46

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Solution

The fourth proportional to 748.54, 1,121.26 and 439.46 is: 658.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.54 : 1,121.26 = 439.46 : x
  2. Step 2: Convert to fraction form
    748.54/1,121.26 = 439.46/x
  3. Step 3: Cross multiply
    748.54x = 1,121.26 × 439.46
  4. Step 4: Simplify right side
    748.54x = 492,748.92
  5. Step 5: Solve for x
    x = 492,748.92/748.54
  6. Step 6: Final answer
    x = 658.28

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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.