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Finding the Third Proportional to 644.75 and 712.75

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Solution

The third proportional to 644.75 and 712.75 is: 787.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.75 : 712.75 = 712.75 : x
  2. Step 2: Convert to fraction form
    644.75/712.75 = 712.75/x
  3. Step 3: Cross multiply
    644.75x = 712.75 × 712.75
  4. Step 4: Simplify right side
    644.75x = 508,012.56
  5. Step 5: Solve for x
    x = 508,012.56/644.75
  6. Step 6: Final answer
    x = 787.92

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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.