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Finding the Fourth Proportional to 399.14, 550.74 and 251.96

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Solution

The fourth proportional to 399.14, 550.74 and 251.96 is: 347.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.14 : 550.74 = 251.96 : x
  2. Step 2: Convert to fraction form
    399.14/550.74 = 251.96/x
  3. Step 3: Cross multiply
    399.14x = 550.74 × 251.96
  4. Step 4: Simplify right side
    399.14x = 138,764.45
  5. Step 5: Solve for x
    x = 138,764.45/399.14
  6. Step 6: Final answer
    x = 347.66

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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.