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Finding the Third Proportional to 138,936 and 215,268

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Solution

The third proportional to 138,936 and 215,268 is: 333,537.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,936 : 215,268 = 215,268 : x
  2. Step 2: Convert to fraction form
    138,936/215,268 = 215,268/x
  3. Step 3: Cross multiply
    138,936x = 215,268 × 215,268
  4. Step 4: Simplify right side
    138,936x = 46,340,311,824
  5. Step 5: Solve for x
    x = 46,340,311,824/138,936
  6. Step 6: Final answer
    x = 333,537.11

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.