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Finding the Third Proportional to 16,420 and 19,660

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Solution

The third proportional to 16,420 and 19,660 is: 23,539.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    16,420 : 19,660 = 19,660 : x
  2. Step 2: Convert to fraction form
    16,420/19,660 = 19,660/x
  3. Step 3: Cross multiply
    16,420x = 19,660 × 19,660
  4. Step 4: Simplify right side
    16,420x = 386,515,600
  5. Step 5: Solve for x
    x = 386,515,600/16,420
  6. Step 6: Final answer
    x = 23,539.32

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Why These Related Problems?

These problems maintain the same ratio (1.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.