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Finding the Fourth Proportional to 71,789.73, 99,069.81 and 39,957.95

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Solution

The fourth proportional to 71,789.73, 99,069.81 and 39,957.95 is: 55,141.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,789.73 : 99,069.81 = 39,957.95 : x
  2. Step 2: Convert to fraction form
    71,789.73/99,069.81 = 39,957.95/x
  3. Step 3: Cross multiply
    71,789.73x = 99,069.81 × 39,957.95
  4. Step 4: Simplify right side
    71,789.73x = 3,958,626,019.14
  5. Step 5: Solve for x
    x = 3,958,626,019.14/71,789.73
  6. Step 6: Final answer
    x = 55,141.95

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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.