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Finding the Fourth Proportional to 404.56, 605.40 and 221.62

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Solution

The fourth proportional to 404.56, 605.40 and 221.62 is: 331.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.56 : 605.40 = 221.62 : x
  2. Step 2: Convert to fraction form
    404.56/605.40 = 221.62/x
  3. Step 3: Cross multiply
    404.56x = 605.40 × 221.62
  4. Step 4: Simplify right side
    404.56x = 134,168.75
  5. Step 5: Solve for x
    x = 134,168.75/404.56
  6. Step 6: Final answer
    x = 331.64

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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.