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Finding the Third Proportional to 81,208 and 122,840

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Solution

The third proportional to 81,208 and 122,840 is: 185,815.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,208 : 122,840 = 122,840 : x
  2. Step 2: Convert to fraction form
    81,208/122,840 = 122,840/x
  3. Step 3: Cross multiply
    81,208x = 122,840 × 122,840
  4. Step 4: Simplify right side
    81,208x = 15,089,665,600
  5. Step 5: Solve for x
    x = 15,089,665,600/81,208
  6. Step 6: Final answer
    x = 185,815.01

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.