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Finding the Third Proportional to 8,991.28 and 21,000.80

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Solution

The third proportional to 8,991.28 and 21,000.80 is: 49,051.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,991.28 : 21,000.80 = 21,000.80 : x
  2. Step 2: Convert to fraction form
    8,991.28/21,000.80 = 21,000.80/x
  3. Step 3: Cross multiply
    8,991.28x = 21,000.80 × 21,000.80
  4. Step 4: Simplify right side
    8,991.28x = 441,033,469.39
  5. Step 5: Solve for x
    x = 441,033,469.39/8,991.28
  6. Step 6: Final answer
    x = 49,051.24

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Why These Related Problems?

These problems maintain the same ratio (2.34) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.