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Finding the Third Proportional to 68,128 and 86,640

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Solution

The third proportional to 68,128 and 86,640 is: 110,182.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,128 : 86,640 = 86,640 : x
  2. Step 2: Convert to fraction form
    68,128/86,640 = 86,640/x
  3. Step 3: Cross multiply
    68,128x = 86,640 × 86,640
  4. Step 4: Simplify right side
    68,128x = 7,506,489,600
  5. Step 5: Solve for x
    x = 7,506,489,600/68,128
  6. Step 6: Final answer
    x = 110,182.15

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Why These Related Problems?

These problems maintain the same ratio (1.27) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.