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Finding the Third Proportional to 669 and 726.75

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Solution

The third proportional to 669 and 726.75 is: 789.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    669 : 726.75 = 726.75 : x
  2. Step 2: Convert to fraction form
    669/726.75 = 726.75/x
  3. Step 3: Cross multiply
    669x = 726.75 × 726.75
  4. Step 4: Simplify right side
    669x = 528,165.56
  5. Step 5: Solve for x
    x = 528,165.56/669
  6. Step 6: Final answer
    x = 789.49

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Why These Related Problems?

These problems maintain the same ratio (1.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.