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Finding the Fourth Proportional to 81,190.91, 121,813.93 and 43,754.73

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Solution

The fourth proportional to 81,190.91, 121,813.93 and 43,754.73 is: 65,646.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,190.91 : 121,813.93 = 43,754.73 : x
  2. Step 2: Convert to fraction form
    81,190.91/121,813.93 = 43,754.73/x
  3. Step 3: Cross multiply
    81,190.91x = 121,813.93 × 43,754.73
  4. Step 4: Simplify right side
    81,190.91x = 5,329,935,654.36
  5. Step 5: Solve for x
    x = 5,329,935,654.36/81,190.91
  6. Step 6: Final answer
    x = 65,646.95

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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.