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Finding the Fourth Proportional to 19,990.80, 29,991.33 and 6,843.29

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Solution

The fourth proportional to 19,990.80, 29,991.33 and 6,843.29 is: 10,266.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,990.80 : 29,991.33 = 6,843.29 : x
  2. Step 2: Convert to fraction form
    19,990.80/29,991.33 = 6,843.29/x
  3. Step 3: Cross multiply
    19,990.80x = 29,991.33 × 6,843.29
  4. Step 4: Simplify right side
    19,990.80x = 205,239,218.72
  5. Step 5: Solve for x
    x = 205,239,218.72/19,990.80
  6. Step 6: Final answer
    x = 10,266.68

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.