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Finding the Fourth Proportional to 399.18, 550.89 and 251.76

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Solution

The fourth proportional to 399.18, 550.89 and 251.76 is: 347.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.18 : 550.89 = 251.76 : x
  2. Step 2: Convert to fraction form
    399.18/550.89 = 251.76/x
  3. Step 3: Cross multiply
    399.18x = 550.89 × 251.76
  4. Step 4: Simplify right side
    399.18x = 138,692.07
  5. Step 5: Solve for x
    x = 138,692.07/399.18
  6. Step 6: Final answer
    x = 347.44

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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.