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Finding the Third Proportional to 86,231 and 128,815

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Solution

The third proportional to 86,231 and 128,815 is: 192,428.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,231 : 128,815 = 128,815 : x
  2. Step 2: Convert to fraction form
    86,231/128,815 = 128,815/x
  3. Step 3: Cross multiply
    86,231x = 128,815 × 128,815
  4. Step 4: Simplify right side
    86,231x = 16,593,304,225
  5. Step 5: Solve for x
    x = 16,593,304,225/86,231
  6. Step 6: Final answer
    x = 192,428.53

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.