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Finding the Fourth Proportional to 490.43, 676.81 and 269.40

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Solution

The fourth proportional to 490.43, 676.81 and 269.40 is: 371.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.43 : 676.81 = 269.40 : x
  2. Step 2: Convert to fraction form
    490.43/676.81 = 269.40/x
  3. Step 3: Cross multiply
    490.43x = 676.81 × 269.40
  4. Step 4: Simplify right side
    490.43x = 182,327.88
  5. Step 5: Solve for x
    x = 182,327.88/490.43
  6. Step 6: Final answer
    x = 371.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.