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Finding the Fourth Proportional to 748.37, 1,123.14 and 518.87

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Solution

The fourth proportional to 748.37, 1,123.14 and 518.87 is: 778.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.37 : 1,123.14 = 518.87 : x
  2. Step 2: Convert to fraction form
    748.37/1,123.14 = 518.87/x
  3. Step 3: Cross multiply
    748.37x = 1,123.14 × 518.87
  4. Step 4: Simplify right side
    748.37x = 582,765.49
  5. Step 5: Solve for x
    x = 582,765.49/748.37
  6. Step 6: Final answer
    x = 778.71

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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.