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Finding the Third Proportional to 721.88 and 1,605.75

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Solution

The third proportional to 721.88 and 1,605.75 is: 3,571.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.88 : 1,605.75 = 1,605.75 : x
  2. Step 2: Convert to fraction form
    721.88/1,605.75 = 1,605.75/x
  3. Step 3: Cross multiply
    721.88x = 1,605.75 × 1,605.75
  4. Step 4: Simplify right side
    721.88x = 2,578,433.06
  5. Step 5: Solve for x
    x = 2,578,433.06/721.88
  6. Step 6: Final answer
    x = 3,571.86

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Why These Related Problems?

These problems maintain the same ratio (2.22) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.