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Finding the Third Proportional to 77.50 and 84.25

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Solution

The third proportional to 77.50 and 84.25 is: 91.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.50 : 84.25 = 84.25 : x
  2. Step 2: Convert to fraction form
    77.50/84.25 = 84.25/x
  3. Step 3: Cross multiply
    77.50x = 84.25 × 84.25
  4. Step 4: Simplify right side
    77.50x = 7,098.06
  5. Step 5: Solve for x
    x = 7,098.06/77.50
  6. Step 6: Final answer
    x = 91.59

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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.