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Finding the Third Proportional to 139.92 and 276.05

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Solution

The third proportional to 139.92 and 276.05 is: 544.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.92 : 276.05 = 276.05 : x
  2. Step 2: Convert to fraction form
    139.92/276.05 = 276.05/x
  3. Step 3: Cross multiply
    139.92x = 276.05 × 276.05
  4. Step 4: Simplify right side
    139.92x = 76,201.88
  5. Step 5: Solve for x
    x = 76,201.88/139.92
  6. Step 6: Final answer
    x = 544.60

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Why These Related Problems?

These problems maintain the same ratio (1.97) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.