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Finding the Fourth Proportional to 748.64, 1,123.11 and 261.73

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Solution

The fourth proportional to 748.64, 1,123.11 and 261.73 is: 392.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.64 : 1,123.11 = 261.73 : x
  2. Step 2: Convert to fraction form
    748.64/1,123.11 = 261.73/x
  3. Step 3: Cross multiply
    748.64x = 1,123.11 × 261.73
  4. Step 4: Simplify right side
    748.64x = 293,951.58
  5. Step 5: Solve for x
    x = 293,951.58/748.64
  6. Step 6: Final answer
    x = 392.65

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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.