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Finding the Third Proportional to 56.25 and 86.75

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Solution

The third proportional to 56.25 and 86.75 is: 133.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.25 : 86.75 = 86.75 : x
  2. Step 2: Convert to fraction form
    56.25/86.75 = 86.75/x
  3. Step 3: Cross multiply
    56.25x = 86.75 × 86.75
  4. Step 4: Simplify right side
    56.25x = 7,525.56
  5. Step 5: Solve for x
    x = 7,525.56/56.25
  6. Step 6: Final answer
    x = 133.79

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.