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Finding the Fourth Proportional to 249.11, 343.76 and 138.57

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Solution

The fourth proportional to 249.11, 343.76 and 138.57 is: 191.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    249.11 : 343.76 = 138.57 : x
  2. Step 2: Convert to fraction form
    249.11/343.76 = 138.57/x
  3. Step 3: Cross multiply
    249.11x = 343.76 × 138.57
  4. Step 4: Simplify right side
    249.11x = 47,635.77
  5. Step 5: Solve for x
    x = 47,635.77/249.11
  6. Step 6: Final answer
    x = 191.22

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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.