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Finding the Fourth Proportional to 269.67, 403.89 and 221.07

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Solution

The fourth proportional to 269.67, 403.89 and 221.07 is: 331.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    269.67 : 403.89 = 221.07 : x
  2. Step 2: Convert to fraction form
    269.67/403.89 = 221.07/x
  3. Step 3: Cross multiply
    269.67x = 403.89 × 221.07
  4. Step 4: Simplify right side
    269.67x = 89,286.45
  5. Step 5: Solve for x
    x = 89,286.45/269.67
  6. Step 6: Final answer
    x = 331.10

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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.