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Finding the Third Proportional to 20,640 and 29,920

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Solution

The third proportional to 20,640 and 29,920 is: 43,372.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,640 : 29,920 = 29,920 : x
  2. Step 2: Convert to fraction form
    20,640/29,920 = 29,920/x
  3. Step 3: Cross multiply
    20,640x = 29,920 × 29,920
  4. Step 4: Simplify right side
    20,640x = 895,206,400
  5. Step 5: Solve for x
    x = 895,206,400/20,640
  6. Step 6: Final answer
    x = 43,372.40

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Why These Related Problems?

These problems maintain the same ratio (1.45) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.