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Finding the Fourth Proportional to 748.92, 1,123.38 and 640.92

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Solution

The fourth proportional to 748.92, 1,123.38 and 640.92 is: 961.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.92 : 1,123.38 = 640.92 : x
  2. Step 2: Convert to fraction form
    748.92/1,123.38 = 640.92/x
  3. Step 3: Cross multiply
    748.92x = 1,123.38 × 640.92
  4. Step 4: Simplify right side
    748.92x = 719,996.71
  5. Step 5: Solve for x
    x = 719,996.71/748.92
  6. Step 6: Final answer
    x = 961.38

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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.