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Finding the Third Proportional to 128,119.50 and 199,059

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Solution

The third proportional to 128,119.50 and 199,059 is: 309,277.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,119.50 : 199,059 = 199,059 : x
  2. Step 2: Convert to fraction form
    128,119.50/199,059 = 199,059/x
  3. Step 3: Cross multiply
    128,119.50x = 199,059 × 199,059
  4. Step 4: Simplify right side
    128,119.50x = 39,624,485,481
  5. Step 5: Solve for x
    x = 39,624,485,481/128,119.50
  6. Step 6: Final answer
    x = 309,277.55

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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.