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Finding the Fourth Proportional to 749.45, 1,123.27 and 423.83

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Solution

The fourth proportional to 749.45, 1,123.27 and 423.83 is: 635.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.45 : 1,123.27 = 423.83 : x
  2. Step 2: Convert to fraction form
    749.45/1,123.27 = 423.83/x
  3. Step 3: Cross multiply
    749.45x = 1,123.27 × 423.83
  4. Step 4: Simplify right side
    749.45x = 476,077.27
  5. Step 5: Solve for x
    x = 476,077.27/749.45
  6. Step 6: Final answer
    x = 635.23

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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.