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Finding the Third Proportional to 68.75 and 76.25

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Solution

The third proportional to 68.75 and 76.25 is: 84.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.75 : 76.25 = 76.25 : x
  2. Step 2: Convert to fraction form
    68.75/76.25 = 76.25/x
  3. Step 3: Cross multiply
    68.75x = 76.25 × 76.25
  4. Step 4: Simplify right side
    68.75x = 5,814.06
  5. Step 5: Solve for x
    x = 5,814.06/68.75
  6. Step 6: Final answer
    x = 84.57

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Why These Related Problems?

These problems maintain the same ratio (1.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.