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Finding the Fourth Proportional to 71,989.36, 99,344.61 and 39,724.29

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Solution

The fourth proportional to 71,989.36, 99,344.61 and 39,724.29 is: 54,819.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,989.36 : 99,344.61 = 39,724.29 : x
  2. Step 2: Convert to fraction form
    71,989.36/99,344.61 = 39,724.29/x
  3. Step 3: Cross multiply
    71,989.36x = 99,344.61 × 39,724.29
  4. Step 4: Simplify right side
    71,989.36x = 3,946,394,097.58
  5. Step 5: Solve for x
    x = 3,946,394,097.58/71,989.36
  6. Step 6: Final answer
    x = 54,819.13

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.