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Finding the Third Proportional to 38.60 and 81.63

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Solution

The third proportional to 38.60 and 81.63 is: 172.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.60 : 81.63 = 81.63 : x
  2. Step 2: Convert to fraction form
    38.60/81.63 = 81.63/x
  3. Step 3: Cross multiply
    38.60x = 81.63 × 81.63
  4. Step 4: Simplify right side
    38.60x = 6,663.92
  5. Step 5: Solve for x
    x = 6,663.92/38.60
  6. Step 6: Final answer
    x = 172.63

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Why These Related Problems?

These problems maintain the same ratio (2.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.