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Finding the Third Proportional to 66.56 and 86.06

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Solution

The third proportional to 66.56 and 86.06 is: 111.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.56 : 86.06 = 86.06 : x
  2. Step 2: Convert to fraction form
    66.56/86.06 = 86.06/x
  3. Step 3: Cross multiply
    66.56x = 86.06 × 86.06
  4. Step 4: Simplify right side
    66.56x = 7,406.75
  5. Step 5: Solve for x
    x = 7,406.75/66.56
  6. Step 6: Final answer
    x = 111.28

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Why These Related Problems?

These problems maintain the same ratio (1.29) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.