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Finding the Third Proportional to 139.38 and 208.44

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Solution

The third proportional to 139.38 and 208.44 is: 311.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.38 : 208.44 = 208.44 : x
  2. Step 2: Convert to fraction form
    139.38/208.44 = 208.44/x
  3. Step 3: Cross multiply
    139.38x = 208.44 × 208.44
  4. Step 4: Simplify right side
    139.38x = 43,446.19
  5. Step 5: Solve for x
    x = 43,446.19/139.38
  6. Step 6: Final answer
    x = 311.72

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.