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Finding the Fourth Proportional to 399.25, 551.11 and 251.88

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Solution

The fourth proportional to 399.25, 551.11 and 251.88 is: 347.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.25 : 551.11 = 251.88 : x
  2. Step 2: Convert to fraction form
    399.25/551.11 = 251.88/x
  3. Step 3: Cross multiply
    399.25x = 551.11 × 251.88
  4. Step 4: Simplify right side
    399.25x = 138,813.59
  5. Step 5: Solve for x
    x = 138,813.59/399.25
  6. Step 6: Final answer
    x = 347.69

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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.