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Finding the Third Proportional to 640.69 and 1,072.97

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Solution

The third proportional to 640.69 and 1,072.97 is: 1,796.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.69 : 1,072.97 = 1,072.97 : x
  2. Step 2: Convert to fraction form
    640.69/1,072.97 = 1,072.97/x
  3. Step 3: Cross multiply
    640.69x = 1,072.97 × 1,072.97
  4. Step 4: Simplify right side
    640.69x = 1,151,261.94
  5. Step 5: Solve for x
    x = 1,151,261.94/640.69
  6. Step 6: Final answer
    x = 1,796.92

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Why These Related Problems?

These problems maintain the same ratio (1.67) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.