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Finding the Third Proportional to 8,390 and 19,845

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Solution

The third proportional to 8,390 and 19,845 is: 46,939.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,390 : 19,845 = 19,845 : x
  2. Step 2: Convert to fraction form
    8,390/19,845 = 19,845/x
  3. Step 3: Cross multiply
    8,390x = 19,845 × 19,845
  4. Step 4: Simplify right side
    8,390x = 393,824,025
  5. Step 5: Solve for x
    x = 393,824,025/8,390
  6. Step 6: Final answer
    x = 46,939.69

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Why These Related Problems?

These problems maintain the same ratio (2.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.