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Finding the Third Proportional to 66.38 and 72.94

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Solution

The third proportional to 66.38 and 72.94 is: 80.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.38 : 72.94 = 72.94 : x
  2. Step 2: Convert to fraction form
    66.38/72.94 = 72.94/x
  3. Step 3: Cross multiply
    66.38x = 72.94 × 72.94
  4. Step 4: Simplify right side
    66.38x = 5,319.88
  5. Step 5: Solve for x
    x = 5,319.88/66.38
  6. Step 6: Final answer
    x = 80.15

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Why These Related Problems?

These problems maintain the same ratio (1.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.