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Finding the Third Proportional to 666.38 and 762.38

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Solution

The third proportional to 666.38 and 762.38 is: 872.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.38 : 762.38 = 762.38 : x
  2. Step 2: Convert to fraction form
    666.38/762.38 = 762.38/x
  3. Step 3: Cross multiply
    666.38x = 762.38 × 762.38
  4. Step 4: Simplify right side
    666.38x = 581,215.64
  5. Step 5: Solve for x
    x = 581,215.64/666.38
  6. Step 6: Final answer
    x = 872.21

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Why These Related Problems?

These problems maintain the same ratio (1.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.