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Finding the Fourth Proportional to 399.91, 551.84 and 222.87

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Solution

The fourth proportional to 399.91, 551.84 and 222.87 is: 307.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.91 : 551.84 = 222.87 : x
  2. Step 2: Convert to fraction form
    399.91/551.84 = 222.87/x
  3. Step 3: Cross multiply
    399.91x = 551.84 × 222.87
  4. Step 4: Simplify right side
    399.91x = 122,988.58
  5. Step 5: Solve for x
    x = 122,988.58/399.91
  6. Step 6: Final answer
    x = 307.54

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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.