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Finding the Fourth Proportional to 399.31, 550.83 and 251.89

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Solution

The fourth proportional to 399.31, 550.83 and 251.89 is: 347.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.31 : 550.83 = 251.89 : x
  2. Step 2: Convert to fraction form
    399.31/550.83 = 251.89/x
  3. Step 3: Cross multiply
    399.31x = 550.83 × 251.89
  4. Step 4: Simplify right side
    399.31x = 138,745.81
  5. Step 5: Solve for x
    x = 138,745.81/399.31
  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.