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Finding the Fourth Proportional to 249.28, 344.03 and 138.78

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Solution

The fourth proportional to 249.28, 344.03 and 138.78 is: 191.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    249.28 : 344.03 = 138.78 : x
  2. Step 2: Convert to fraction form
    249.28/344.03 = 138.78/x
  3. Step 3: Cross multiply
    249.28x = 344.03 × 138.78
  4. Step 4: Simplify right side
    249.28x = 47,743.79
  5. Step 5: Solve for x
    x = 47,743.79/249.28
  6. Step 6: Final answer
    x = 191.53

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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.