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Finding the Fourth Proportional to 404.40, 606.20 and 221.42

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Solution

The fourth proportional to 404.40, 606.20 and 221.42 is: 331.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.40 : 606.20 = 221.42 : x
  2. Step 2: Convert to fraction form
    404.40/606.20 = 221.42/x
  3. Step 3: Cross multiply
    404.40x = 606.20 × 221.42
  4. Step 4: Simplify right side
    404.40x = 134,220.67
  5. Step 5: Solve for x
    x = 134,220.67/404.40
  6. Step 6: Final answer
    x = 331.90

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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.