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Finding the Third Proportional to 53,811 and 81,621

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Solution

The third proportional to 53,811 and 81,621 is: 123,803.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    53,811 : 81,621 = 81,621 : x
  2. Step 2: Convert to fraction form
    53,811/81,621 = 81,621/x
  3. Step 3: Cross multiply
    53,811x = 81,621 × 81,621
  4. Step 4: Simplify right side
    53,811x = 6,661,987,641
  5. Step 5: Solve for x
    x = 6,661,987,641/53,811
  6. Step 6: Final answer
    x = 123,803.45

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Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.