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Finding the Third Proportional to 66.75 and 108.50

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Solution

The third proportional to 66.75 and 108.50 is: 176.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.75 : 108.50 = 108.50 : x
  2. Step 2: Convert to fraction form
    66.75/108.50 = 108.50/x
  3. Step 3: Cross multiply
    66.75x = 108.50 × 108.50
  4. Step 4: Simplify right side
    66.75x = 11,772.25
  5. Step 5: Solve for x
    x = 11,772.25/66.75
  6. Step 6: Final answer
    x = 176.36

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Why These Related Problems?

These problems maintain the same ratio (1.63) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.