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Finding the Third Proportional to 128,415 and 199,616

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Solution

The third proportional to 128,415 and 199,616 is: 310,295.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,415 : 199,616 = 199,616 : x
  2. Step 2: Convert to fraction form
    128,415/199,616 = 199,616/x
  3. Step 3: Cross multiply
    128,415x = 199,616 × 199,616
  4. Step 4: Simplify right side
    128,415x = 39,846,547,456
  5. Step 5: Solve for x
    x = 39,846,547,456/128,415
  6. Step 6: Final answer
    x = 310,295.12

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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.