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Finding the Fourth Proportional to 489.91, 676.11 and 268.90

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Solution

The fourth proportional to 489.91, 676.11 and 268.90 is: 371.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.91 : 676.11 = 268.90 : x
  2. Step 2: Convert to fraction form
    489.91/676.11 = 268.90/x
  3. Step 3: Cross multiply
    489.91x = 676.11 × 268.90
  4. Step 4: Simplify right side
    489.91x = 181,805.98
  5. Step 5: Solve for x
    x = 181,805.98/489.91
  6. Step 6: Final answer
    x = 371.10

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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.