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Finding the Third Proportional to 20,880 and 39,824

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Solution

The third proportional to 20,880 and 39,824 is: 75,955.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,880 : 39,824 = 39,824 : x
  2. Step 2: Convert to fraction form
    20,880/39,824 = 39,824/x
  3. Step 3: Cross multiply
    20,880x = 39,824 × 39,824
  4. Step 4: Simplify right side
    20,880x = 1,585,950,976
  5. Step 5: Solve for x
    x = 1,585,950,976/20,880
  6. Step 6: Final answer
    x = 75,955.51

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.91) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.