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Finding the Fourth Proportional to 748.66, 1,123.26 and 261.78

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Solution

The fourth proportional to 748.66, 1,123.26 and 261.78 is: 392.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.66 : 1,123.26 = 261.78 : x
  2. Step 2: Convert to fraction form
    748.66/1,123.26 = 261.78/x
  3. Step 3: Cross multiply
    748.66x = 1,123.26 × 261.78
  4. Step 4: Simplify right side
    748.66x = 294,049.81
  5. Step 5: Solve for x
    x = 294,049.81/748.66
  6. Step 6: Final answer
    x = 392.77

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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.