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Finding the Fourth Proportional to 71,991.59, 107,980.09 and 19,406.39

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Solution

The fourth proportional to 71,991.59, 107,980.09 and 19,406.39 is: 29,107.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,991.59 : 107,980.09 = 19,406.39 : x
  2. Step 2: Convert to fraction form
    71,991.59/107,980.09 = 19,406.39/x
  3. Step 3: Cross multiply
    71,991.59x = 107,980.09 × 19,406.39
  4. Step 4: Simplify right side
    71,991.59x = 2,095,503,150.36
  5. Step 5: Solve for x
    x = 2,095,503,150.36/71,991.59
  6. Step 6: Final answer
    x = 29,107.61

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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.