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Finding the Third Proportional to 128,970.75 and 199,288.13

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Solution

The third proportional to 128,970.75 and 199,288.13 is: 307,943.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,970.75 : 199,288.13 = 199,288.13 : x
  2. Step 2: Convert to fraction form
    128,970.75/199,288.13 = 199,288.13/x
  3. Step 3: Cross multiply
    128,970.75x = 199,288.13 × 199,288.13
  4. Step 4: Simplify right side
    128,970.75x = 39,715,756,766.02
  5. Step 5: Solve for x
    x = 39,715,756,766.02/128,970.75
  6. Step 6: Final answer
    x = 307,943.91

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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.