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Finding the Third Proportional to 77.50 and 84.75

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Solution

The third proportional to 77.50 and 84.75 is: 92.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.50 : 84.75 = 84.75 : x
  2. Step 2: Convert to fraction form
    77.50/84.75 = 84.75/x
  3. Step 3: Cross multiply
    77.50x = 84.75 × 84.75
  4. Step 4: Simplify right side
    77.50x = 7,182.56
  5. Step 5: Solve for x
    x = 7,182.56/77.50
  6. Step 6: Final answer
    x = 92.68

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Why These Related Problems?

These problems maintain the same ratio (1.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.