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Finding the Fourth Proportional to 398.44, 550.16 and 251.43

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Solution

The fourth proportional to 398.44, 550.16 and 251.43 is: 347.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.44 : 550.16 = 251.43 : x
  2. Step 2: Convert to fraction form
    398.44/550.16 = 251.43/x
  3. Step 3: Cross multiply
    398.44x = 550.16 × 251.43
  4. Step 4: Simplify right side
    398.44x = 138,326.73
  5. Step 5: Solve for x
    x = 138,326.73/398.44
  6. Step 6: Final answer
    x = 347.17

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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.