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Finding the Third Proportional to 297.38 and 640.88

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Solution

The third proportional to 297.38 and 640.88 is: 1,381.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    297.38 : 640.88 = 640.88 : x
  2. Step 2: Convert to fraction form
    297.38/640.88 = 640.88/x
  3. Step 3: Cross multiply
    297.38x = 640.88 × 640.88
  4. Step 4: Simplify right side
    297.38x = 410,720.77
  5. Step 5: Solve for x
    x = 410,720.77/297.38
  6. Step 6: Final answer
    x = 1,381.15

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.