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Finding the Third Proportional to 61.50 and 86.11

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Solution

The third proportional to 61.50 and 86.11 is: 120.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.50 : 86.11 = 86.11 : x
  2. Step 2: Convert to fraction form
    61.50/86.11 = 86.11/x
  3. Step 3: Cross multiply
    61.50x = 86.11 × 86.11
  4. Step 4: Simplify right side
    61.50x = 7,414.82
  5. Step 5: Solve for x
    x = 7,414.82/61.50
  6. Step 6: Final answer
    x = 120.57

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.