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Finding the Fourth Proportional to 19,991.13, 29,986.86 and 6,843.61

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Solution

The fourth proportional to 19,991.13, 29,986.86 and 6,843.61 is: 10,265.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,991.13 : 29,986.86 = 6,843.61 : x
  2. Step 2: Convert to fraction form
    19,991.13/29,986.86 = 6,843.61/x
  3. Step 3: Cross multiply
    19,991.13x = 29,986.86 × 6,843.61
  4. Step 4: Simplify right side
    19,991.13x = 205,218,374.96
  5. Step 5: Solve for x
    x = 205,218,374.96/19,991.13
  6. Step 6: Final answer
    x = 10,265.47

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1.5x scale

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.