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Finding the Third Proportional to 805 and 1,729

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Solution

The third proportional to 805 and 1,729 is: 3,713.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    805 : 1,729 = 1,729 : x
  2. Step 2: Convert to fraction form
    805/1,729 = 1,729/x
  3. Step 3: Cross multiply
    805x = 1,729 × 1,729
  4. Step 4: Simplify right side
    805x = 2,989,441
  5. Step 5: Solve for x
    x = 2,989,441/805
  6. Step 6: Final answer
    x = 3,713.59

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.