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Finding the Fourth Proportional to 749.27, 1,123.90 and 423.96

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Solution

The fourth proportional to 749.27, 1,123.90 and 423.96 is: 635.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.27 : 1,123.90 = 423.96 : x
  2. Step 2: Convert to fraction form
    749.27/1,123.90 = 423.96/x
  3. Step 3: Cross multiply
    749.27x = 1,123.90 × 423.96
  4. Step 4: Simplify right side
    749.27x = 476,487.58
  5. Step 5: Solve for x
    x = 476,487.58/749.27
  6. Step 6: Final answer
    x = 635.94

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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.