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Finding the Third Proportional to 644.91 and 1,379.81

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Solution

The third proportional to 644.91 and 1,379.81 is: 2,952.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.91 : 1,379.81 = 1,379.81 : x
  2. Step 2: Convert to fraction form
    644.91/1,379.81 = 1,379.81/x
  3. Step 3: Cross multiply
    644.91x = 1,379.81 × 1,379.81
  4. Step 4: Simplify right side
    644.91x = 1,903,882.54
  5. Step 5: Solve for x
    x = 1,903,882.54/644.91
  6. Step 6: Final answer
    x = 2,952.18

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Why These Related Problems?

These problems maintain the same ratio (2.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.