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Finding the Fourth Proportional to 748.69, 1,123.08 and 261.79

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Solution

The fourth proportional to 748.69, 1,123.08 and 261.79 is: 392.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.69 : 1,123.08 = 261.79 : x
  2. Step 2: Convert to fraction form
    748.69/1,123.08 = 261.79/x
  3. Step 3: Cross multiply
    748.69x = 1,123.08 × 261.79
  4. Step 4: Simplify right side
    748.69x = 294,011.11
  5. Step 5: Solve for x
    x = 294,011.11/748.69
  6. Step 6: Final answer
    x = 392.70

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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.