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Finding the Fourth Proportional to 249.18, 343.89 and 138.69

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Solution

The fourth proportional to 249.18, 343.89 and 138.69 is: 191.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    249.18 : 343.89 = 138.69 : x
  2. Step 2: Convert to fraction form
    249.18/343.89 = 138.69/x
  3. Step 3: Cross multiply
    249.18x = 343.89 × 138.69
  4. Step 4: Simplify right side
    249.18x = 47,691.69
  5. Step 5: Solve for x
    x = 47,691.69/249.18
  6. Step 6: Final answer
    x = 191.40

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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.