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Finding the Fourth Proportional to 249.05, 343.70 and 138.53

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Solution

The fourth proportional to 249.05, 343.70 and 138.53 is: 191.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    249.05 : 343.70 = 138.53 : x
  2. Step 2: Convert to fraction form
    249.05/343.70 = 138.53/x
  3. Step 3: Cross multiply
    249.05x = 343.70 × 138.53
  4. Step 4: Simplify right side
    249.05x = 47,613.45
  5. Step 5: Solve for x
    x = 47,613.45/249.05
  6. Step 6: Final answer
    x = 191.18

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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.