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Finding the Third Proportional to 61,242 and 135,640

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Solution

The third proportional to 61,242 and 135,640 is: 300,418.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,242 : 135,640 = 135,640 : x
  2. Step 2: Convert to fraction form
    61,242/135,640 = 135,640/x
  3. Step 3: Cross multiply
    61,242x = 135,640 × 135,640
  4. Step 4: Simplify right side
    61,242x = 18,398,209,600
  5. Step 5: Solve for x
    x = 18,398,209,600/61,242
  6. Step 6: Final answer
    x = 300,418.17

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Why These Related Problems?

These problems maintain the same ratio (2.21) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.