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Finding the Third Proportional to 42,639 and 66,885

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Solution

The third proportional to 42,639 and 66,885 is: 104,918.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,639 : 66,885 = 66,885 : x
  2. Step 2: Convert to fraction form
    42,639/66,885 = 66,885/x
  3. Step 3: Cross multiply
    42,639x = 66,885 × 66,885
  4. Step 4: Simplify right side
    42,639x = 4,473,603,225
  5. Step 5: Solve for x
    x = 4,473,603,225/42,639
  6. Step 6: Final answer
    x = 104,918.11

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Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.