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Finding the Fourth Proportional to 269.28, 403.89 and 86.65

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Solution

The fourth proportional to 269.28, 403.89 and 86.65 is: 129.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    269.28 : 403.89 = 86.65 : x
  2. Step 2: Convert to fraction form
    269.28/403.89 = 86.65/x
  3. Step 3: Cross multiply
    269.28x = 403.89 × 86.65
  4. Step 4: Simplify right side
    269.28x = 34,996.64
  5. Step 5: Solve for x
    x = 34,996.64/269.28
  6. Step 6: Final answer
    x = 129.96

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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.