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Finding the Third Proportional to 33,690 and 72,987

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Solution

The third proportional to 33,690 and 72,987 is: 158,121.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    33,690 : 72,987 = 72,987 : x
  2. Step 2: Convert to fraction form
    33,690/72,987 = 72,987/x
  3. Step 3: Cross multiply
    33,690x = 72,987 × 72,987
  4. Step 4: Simplify right side
    33,690x = 5,327,102,169
  5. Step 5: Solve for x
    x = 5,327,102,169/33,690
  6. Step 6: Final answer
    x = 158,121.17

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.