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Finding the Third Proportional to 638.72 and 756.84

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Solution

The third proportional to 638.72 and 756.84 is: 896.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.72 : 756.84 = 756.84 : x
  2. Step 2: Convert to fraction form
    638.72/756.84 = 756.84/x
  3. Step 3: Cross multiply
    638.72x = 756.84 × 756.84
  4. Step 4: Simplify right side
    638.72x = 572,812.46
  5. Step 5: Solve for x
    x = 572,812.46/638.72
  6. Step 6: Final answer
    x = 896.81

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Why These Related Problems?

These problems maintain the same ratio (1.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.