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Finding the Fourth Proportional to 71,374.05, 107,039.75 and 21,440.79

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Solution

The fourth proportional to 71,374.05, 107,039.75 and 21,440.79 is: 32,154.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,374.05 : 107,039.75 = 21,440.79 : x
  2. Step 2: Convert to fraction form
    71,374.05/107,039.75 = 21,440.79/x
  3. Step 3: Cross multiply
    71,374.05x = 107,039.75 × 21,440.79
  4. Step 4: Simplify right side
    71,374.05x = 2,295,016,694.20
  5. Step 5: Solve for x
    x = 2,295,016,694.20/71,374.05
  6. Step 6: Final answer
    x = 32,154.78

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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.