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Finding the Fourth Proportional to 78,769.97, 108,793.29 and 57,355.49

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Solution

The fourth proportional to 78,769.97, 108,793.29 and 57,355.49 is: 79,216.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,769.97 : 108,793.29 = 57,355.49 : x
  2. Step 2: Convert to fraction form
    78,769.97/108,793.29 = 57,355.49/x
  3. Step 3: Cross multiply
    78,769.97x = 108,793.29 × 57,355.49
  4. Step 4: Simplify right side
    78,769.97x = 6,239,892,943.73
  5. Step 5: Solve for x
    x = 6,239,892,943.73/78,769.97
  6. Step 6: Final answer
    x = 79,216.65

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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.