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Finding the Third Proportional to 299.50 and 644.75

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Solution

The third proportional to 299.50 and 644.75 is: 1,387.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    299.50 : 644.75 = 644.75 : x
  2. Step 2: Convert to fraction form
    299.50/644.75 = 644.75/x
  3. Step 3: Cross multiply
    299.50x = 644.75 × 644.75
  4. Step 4: Simplify right side
    299.50x = 415,702.56
  5. Step 5: Solve for x
    x = 415,702.56/299.50
  6. Step 6: Final answer
    x = 1,387.99

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.