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Finding the Fourth Proportional to 269.88, 404.10 and 211.80

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Solution

The fourth proportional to 269.88, 404.10 and 211.80 is: 317.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    269.88 : 404.10 = 211.80 : x
  2. Step 2: Convert to fraction form
    269.88/404.10 = 211.80/x
  3. Step 3: Cross multiply
    269.88x = 404.10 × 211.80
  4. Step 4: Simplify right side
    269.88x = 85,588.38
  5. Step 5: Solve for x
    x = 85,588.38/269.88
  6. Step 6: Final answer
    x = 317.13

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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.