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Finding the Third Proportional to 40.78 and 84.94

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Solution

The third proportional to 40.78 and 84.94 is: 176.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.78 : 84.94 = 84.94 : x
  2. Step 2: Convert to fraction form
    40.78/84.94 = 84.94/x
  3. Step 3: Cross multiply
    40.78x = 84.94 × 84.94
  4. Step 4: Simplify right side
    40.78x = 7,214.38
  5. Step 5: Solve for x
    x = 7,214.38/40.78
  6. Step 6: Final answer
    x = 176.90

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Why These Related Problems?

These problems maintain the same ratio (2.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.