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Finding the Fourth Proportional to 748.11, 1,120.15 and 487.33

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Solution

The fourth proportional to 748.11, 1,120.15 and 487.33 is: 729.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.11 : 1,120.15 = 487.33 : x
  2. Step 2: Convert to fraction form
    748.11/1,120.15 = 487.33/x
  3. Step 3: Cross multiply
    748.11x = 1,120.15 × 487.33
  4. Step 4: Simplify right side
    748.11x = 545,882.70
  5. Step 5: Solve for x
    x = 545,882.70/748.11
  6. Step 6: Final answer
    x = 729.68

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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.