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Finding the Third Proportional to 86.25 and 105.75

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Solution

The third proportional to 86.25 and 105.75 is: 129.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.25 : 105.75 = 105.75 : x
  2. Step 2: Convert to fraction form
    86.25/105.75 = 105.75/x
  3. Step 3: Cross multiply
    86.25x = 105.75 × 105.75
  4. Step 4: Simplify right side
    86.25x = 11,183.06
  5. Step 5: Solve for x
    x = 11,183.06/86.25
  6. Step 6: Final answer
    x = 129.66

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Why These Related Problems?

These problems maintain the same ratio (1.23) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.