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Finding the Third Proportional to 690 and 766

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Solution

The third proportional to 690 and 766 is: 850.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    690 : 766 = 766 : x
  2. Step 2: Convert to fraction form
    690/766 = 766/x
  3. Step 3: Cross multiply
    690x = 766 × 766
  4. Step 4: Simplify right side
    690x = 586,756
  5. Step 5: Solve for x
    x = 586,756/690
  6. Step 6: Final answer
    x = 850.37

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Why These Related Problems?

These problems maintain the same ratio (1.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.