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Finding the Fourth Proportional to 399.59, 551.42 and 222.55

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Solution

The fourth proportional to 399.59, 551.42 and 222.55 is: 307.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.59 : 551.42 = 222.55 : x
  2. Step 2: Convert to fraction form
    399.59/551.42 = 222.55/x
  3. Step 3: Cross multiply
    399.59x = 551.42 × 222.55
  4. Step 4: Simplify right side
    399.59x = 122,717.70
  5. Step 5: Solve for x
    x = 122,717.70/399.59
  6. Step 6: Final answer
    x = 307.11

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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.