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Finding the Third Proportional to 61,872 and 135,840

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Solution

The third proportional to 61,872 and 135,840 is: 298,236.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,872 : 135,840 = 135,840 : x
  2. Step 2: Convert to fraction form
    61,872/135,840 = 135,840/x
  3. Step 3: Cross multiply
    61,872x = 135,840 × 135,840
  4. Step 4: Simplify right side
    61,872x = 18,452,505,600
  5. Step 5: Solve for x
    x = 18,452,505,600/61,872
  6. Step 6: Final answer
    x = 298,236.77

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.