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Finding the Fourth Proportional to 748.33, 1,121.18 and 487.91

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Solution

The fourth proportional to 748.33, 1,121.18 and 487.91 is: 731.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.33 : 1,121.18 = 487.91 : x
  2. Step 2: Convert to fraction form
    748.33/1,121.18 = 487.91/x
  3. Step 3: Cross multiply
    748.33x = 1,121.18 × 487.91
  4. Step 4: Simplify right side
    748.33x = 547,034.93
  5. Step 5: Solve for x
    x = 547,034.93/748.33
  6. Step 6: Final answer
    x = 731.01

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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.