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Finding the Third Proportional to 86,621 and 135,401

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Solution

The third proportional to 86,621 and 135,401 is: 211,651.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,621 : 135,401 = 135,401 : x
  2. Step 2: Convert to fraction form
    86,621/135,401 = 135,401/x
  3. Step 3: Cross multiply
    86,621x = 135,401 × 135,401
  4. Step 4: Simplify right side
    86,621x = 18,333,430,801
  5. Step 5: Solve for x
    x = 18,333,430,801/86,621
  6. Step 6: Final answer
    x = 211,651.11

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.