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Finding the Fourth Proportional to 490.31, 676.61 and 269.28

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Solution

The fourth proportional to 490.31, 676.61 and 269.28 is: 371.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.31 : 676.61 = 269.28 : x
  2. Step 2: Convert to fraction form
    490.31/676.61 = 269.28/x
  3. Step 3: Cross multiply
    490.31x = 676.61 × 269.28
  4. Step 4: Simplify right side
    490.31x = 182,199.91
  5. Step 5: Solve for x
    x = 182,199.91/490.31
  6. Step 6: Final answer
    x = 371.60

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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.