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Finding the Third Proportional to 61.13 and 86.75

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Solution

The third proportional to 61.13 and 86.75 is: 123.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.13 : 86.75 = 86.75 : x
  2. Step 2: Convert to fraction form
    61.13/86.75 = 86.75/x
  3. Step 3: Cross multiply
    61.13x = 86.75 × 86.75
  4. Step 4: Simplify right side
    61.13x = 7,525.56
  5. Step 5: Solve for x
    x = 7,525.56/61.13
  6. Step 6: Final answer
    x = 123.12

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Why These Related Problems?

These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.