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Finding the Third Proportional to 129,611 and 211,643

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Solution

The third proportional to 129,611 and 211,643 is: 345,593.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,611 : 211,643 = 211,643 : x
  2. Step 2: Convert to fraction form
    129,611/211,643 = 211,643/x
  3. Step 3: Cross multiply
    129,611x = 211,643 × 211,643
  4. Step 4: Simplify right side
    129,611x = 44,792,759,449
  5. Step 5: Solve for x
    x = 44,792,759,449/129,611
  6. Step 6: Final answer
    x = 345,593.81

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Why These Related Problems?

These problems maintain the same ratio (1.63) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.