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Finding the Fourth Proportional to 249.90, 344.89 and 139.39

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Solution

The fourth proportional to 249.90, 344.89 and 139.39 is: 192.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    249.90 : 344.89 = 139.39 : x
  2. Step 2: Convert to fraction form
    249.90/344.89 = 139.39/x
  3. Step 3: Cross multiply
    249.90x = 344.89 × 139.39
  4. Step 4: Simplify right side
    249.90x = 48,072.75
  5. Step 5: Solve for x
    x = 48,072.75/249.90
  6. Step 6: Final answer
    x = 192.37

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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.