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Finding the Third Proportional to 78,669 and 117,981

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Solution

The third proportional to 78,669 and 117,981 is: 176,937.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,669 : 117,981 = 117,981 : x
  2. Step 2: Convert to fraction form
    78,669/117,981 = 117,981/x
  3. Step 3: Cross multiply
    78,669x = 117,981 × 117,981
  4. Step 4: Simplify right side
    78,669x = 13,919,516,361
  5. Step 5: Solve for x
    x = 13,919,516,361/78,669
  6. Step 6: Final answer
    x = 176,937.76

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.