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Finding the Fourth Proportional to 399.38, 550.90 and 251.90

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Solution

The fourth proportional to 399.38, 550.90 and 251.90 is: 347.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.38 : 550.90 = 251.90 : x
  2. Step 2: Convert to fraction form
    399.38/550.90 = 251.90/x
  3. Step 3: Cross multiply
    399.38x = 550.90 × 251.90
  4. Step 4: Simplify right side
    399.38x = 138,771.71
  5. Step 5: Solve for x
    x = 138,771.71/399.38
  6. Step 6: Final answer
    x = 347.47

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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.