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Finding the Fourth Proportional to 399.45, 551.22 and 222.41

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Solution

The fourth proportional to 399.45, 551.22 and 222.41 is: 306.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.45 : 551.22 = 222.41 : x
  2. Step 2: Convert to fraction form
    399.45/551.22 = 222.41/x
  3. Step 3: Cross multiply
    399.45x = 551.22 × 222.41
  4. Step 4: Simplify right side
    399.45x = 122,594.64
  5. Step 5: Solve for x
    x = 122,594.64/399.45
  6. Step 6: Final answer
    x = 306.91

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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.