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Finding the Fourth Proportional to 399.17, 550.71 and 251.75

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Solution

The fourth proportional to 399.17, 550.71 and 251.75 is: 347.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.17 : 550.71 = 251.75 : x
  2. Step 2: Convert to fraction form
    399.17/550.71 = 251.75/x
  3. Step 3: Cross multiply
    399.17x = 550.71 × 251.75
  4. Step 4: Simplify right side
    399.17x = 138,638.49
  5. Step 5: Solve for x
    x = 138,638.49/399.17
  6. Step 6: Final answer
    x = 347.32

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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.