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Finding the Fourth Proportional to 78,930.82, 108,924.92 and 43,121.43

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Solution

The fourth proportional to 78,930.82, 108,924.92 and 43,121.43 is: 59,507.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,930.82 : 108,924.92 = 43,121.43 : x
  2. Step 2: Convert to fraction form
    78,930.82/108,924.92 = 43,121.43/x
  3. Step 3: Cross multiply
    78,930.82x = 108,924.92 × 43,121.43
  4. Step 4: Simplify right side
    78,930.82x = 4,696,998,313.04
  5. Step 5: Solve for x
    x = 4,696,998,313.04/78,930.82
  6. Step 6: Final answer
    x = 59,507.79

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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.