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Finding the Third Proportional to 128,722.50 and 199,311

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Solution

The third proportional to 128,722.50 and 199,311 is: 308,608.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,722.50 : 199,311 = 199,311 : x
  2. Step 2: Convert to fraction form
    128,722.50/199,311 = 199,311/x
  3. Step 3: Cross multiply
    128,722.50x = 199,311 × 199,311
  4. Step 4: Simplify right side
    128,722.50x = 39,724,874,721
  5. Step 5: Solve for x
    x = 39,724,874,721/128,722.50
  6. Step 6: Final answer
    x = 308,608.63

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.