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Finding the Third Proportional to 19,420 and 39,668

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Solution

The third proportional to 19,420 and 39,668 is: 81,027.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,420 : 39,668 = 39,668 : x
  2. Step 2: Convert to fraction form
    19,420/39,668 = 39,668/x
  3. Step 3: Cross multiply
    19,420x = 39,668 × 39,668
  4. Step 4: Simplify right side
    19,420x = 1,573,550,224
  5. Step 5: Solve for x
    x = 1,573,550,224/19,420
  6. Step 6: Final answer
    x = 81,027.30

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Why These Related Problems?

These problems maintain the same ratio (2.04) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.