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Finding the Third Proportional to 81,450 and 121,555

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Solution

The third proportional to 81,450 and 121,555 is: 181,407.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,450 : 121,555 = 121,555 : x
  2. Step 2: Convert to fraction form
    81,450/121,555 = 121,555/x
  3. Step 3: Cross multiply
    81,450x = 121,555 × 121,555
  4. Step 4: Simplify right side
    81,450x = 14,775,618,025
  5. Step 5: Solve for x
    x = 14,775,618,025/81,450
  6. Step 6: Final answer
    x = 181,407.22

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.