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Finding the Fourth Proportional to 399.94, 551.91 and 222.90

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Solution

The fourth proportional to 399.94, 551.91 and 222.90 is: 307.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.94 : 551.91 = 222.90 : x
  2. Step 2: Convert to fraction form
    399.94/551.91 = 222.90/x
  3. Step 3: Cross multiply
    399.94x = 551.91 × 222.90
  4. Step 4: Simplify right side
    399.94x = 123,020.74
  5. Step 5: Solve for x
    x = 123,020.74/399.94
  6. Step 6: Final answer
    x = 307.60

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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.