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Finding the Third Proportional to 39,921 and 66,531

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Solution

The third proportional to 39,921 and 66,531 is: 110,878.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,921 : 66,531 = 66,531 : x
  2. Step 2: Convert to fraction form
    39,921/66,531 = 66,531/x
  3. Step 3: Cross multiply
    39,921x = 66,531 × 66,531
  4. Step 4: Simplify right side
    39,921x = 4,426,373,961
  5. Step 5: Solve for x
    x = 4,426,373,961/39,921
  6. Step 6: Final answer
    x = 110,878.33

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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.