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Finding the Third Proportional to 687.45 and 757.69

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Solution

The third proportional to 687.45 and 757.69 is: 835.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.45 : 757.69 = 757.69 : x
  2. Step 2: Convert to fraction form
    687.45/757.69 = 757.69/x
  3. Step 3: Cross multiply
    687.45x = 757.69 × 757.69
  4. Step 4: Simplify right side
    687.45x = 574,090.35
  5. Step 5: Solve for x
    x = 574,090.35/687.45
  6. Step 6: Final answer
    x = 835.11

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Why These Related Problems?

These problems maintain the same ratio (1.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.