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Finding the Fourth Proportional to 399.12, 550.72 and 251.95

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Solution

The fourth proportional to 399.12, 550.72 and 251.95 is: 347.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.12 : 550.72 = 251.95 : x
  2. Step 2: Convert to fraction form
    399.12/550.72 = 251.95/x
  3. Step 3: Cross multiply
    399.12x = 550.72 × 251.95
  4. Step 4: Simplify right side
    399.12x = 138,753.90
  5. Step 5: Solve for x
    x = 138,753.90/399.12
  6. Step 6: Final answer
    x = 347.65

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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.