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Finding the Fourth Proportional to 399.01, 550.58 and 221.96

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Solution

The fourth proportional to 399.01, 550.58 and 221.96 is: 306.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.01 : 550.58 = 221.96 : x
  2. Step 2: Convert to fraction form
    399.01/550.58 = 221.96/x
  3. Step 3: Cross multiply
    399.01x = 550.58 × 221.96
  4. Step 4: Simplify right side
    399.01x = 122,202.87
  5. Step 5: Solve for x
    x = 122,202.87/399.01
  6. Step 6: Final answer
    x = 306.27

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.