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Finding the Third Proportional to 138.66 and 202.78

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Solution

The third proportional to 138.66 and 202.78 is: 296.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.66 : 202.78 = 202.78 : x
  2. Step 2: Convert to fraction form
    138.66/202.78 = 202.78/x
  3. Step 3: Cross multiply
    138.66x = 202.78 × 202.78
  4. Step 4: Simplify right side
    138.66x = 41,120.24
  5. Step 5: Solve for x
    x = 41,120.24/138.66
  6. Step 6: Final answer
    x = 296.56

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Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.