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Finding the Third Proportional to 81,720 and 112,536

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Solution

The third proportional to 81,720 and 112,536 is: 154,972.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,720 : 112,536 = 112,536 : x
  2. Step 2: Convert to fraction form
    81,720/112,536 = 112,536/x
  3. Step 3: Cross multiply
    81,720x = 112,536 × 112,536
  4. Step 4: Simplify right side
    81,720x = 12,664,351,296
  5. Step 5: Solve for x
    x = 12,664,351,296/81,720
  6. Step 6: Final answer
    x = 154,972.48

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.