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Finding the Third Proportional to 128,121.75 and 275,926.50

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Solution

The third proportional to 128,121.75 and 275,926.50 is: 594,242.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,121.75 : 275,926.50 = 275,926.50 : x
  2. Step 2: Convert to fraction form
    128,121.75/275,926.50 = 275,926.50/x
  3. Step 3: Cross multiply
    128,121.75x = 275,926.50 × 275,926.50
  4. Step 4: Simplify right side
    128,121.75x = 76,135,433,402.25
  5. Step 5: Solve for x
    x = 76,135,433,402.25/128,121.75
  6. Step 6: Final answer
    x = 594,242.85

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.