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Finding the Third Proportional to 51,291 and 81,149

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Solution

The third proportional to 51,291 and 81,149 is: 128,388.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    51,291 : 81,149 = 81,149 : x
  2. Step 2: Convert to fraction form
    51,291/81,149 = 81,149/x
  3. Step 3: Cross multiply
    51,291x = 81,149 × 81,149
  4. Step 4: Simplify right side
    51,291x = 6,585,160,201
  5. Step 5: Solve for x
    x = 6,585,160,201/51,291
  6. Step 6: Final answer
    x = 128,388.22

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Why These Related Problems?

These problems maintain the same ratio (1.58) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.