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Finding the Third Proportional to 39,989 and 66,642

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Solution

The third proportional to 39,989 and 66,642 is: 111,059.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,989 : 66,642 = 66,642 : x
  2. Step 2: Convert to fraction form
    39,989/66,642 = 66,642/x
  3. Step 3: Cross multiply
    39,989x = 66,642 × 66,642
  4. Step 4: Simplify right side
    39,989x = 4,441,156,164
  5. Step 5: Solve for x
    x = 4,441,156,164/39,989
  6. Step 6: Final answer
    x = 111,059.45

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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.