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Finding the Third Proportional to 86,720 and 117,792

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Solution

The third proportional to 86,720 and 117,792 is: 159,997.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,720 : 117,792 = 117,792 : x
  2. Step 2: Convert to fraction form
    86,720/117,792 = 117,792/x
  3. Step 3: Cross multiply
    86,720x = 117,792 × 117,792
  4. Step 4: Simplify right side
    86,720x = 13,874,955,264
  5. Step 5: Solve for x
    x = 13,874,955,264/86,720
  6. Step 6: Final answer
    x = 159,997.18

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.