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Finding the Third Proportional to 77.50 and 83.75

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Solution

The third proportional to 77.50 and 83.75 is: 90.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.50 : 83.75 = 83.75 : x
  2. Step 2: Convert to fraction form
    77.50/83.75 = 83.75/x
  3. Step 3: Cross multiply
    77.50x = 83.75 × 83.75
  4. Step 4: Simplify right side
    77.50x = 7,014.06
  5. Step 5: Solve for x
    x = 7,014.06/77.50
  6. Step 6: Final answer
    x = 90.50

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Why These Related Problems?

These problems maintain the same ratio (1.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.