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Finding the Fourth Proportional to 138,601.80, 207,902.70 and 72,171.68

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Solution

The fourth proportional to 138,601.80, 207,902.70 and 72,171.68 is: 108,257.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,601.80 : 207,902.70 = 72,171.68 : x
  2. Step 2: Convert to fraction form
    138,601.80/207,902.70 = 72,171.68/x
  3. Step 3: Cross multiply
    138,601.80x = 207,902.70 × 72,171.68
  4. Step 4: Simplify right side
    138,601.80x = 15,004,686,096.02
  5. Step 5: Solve for x
    x = 15,004,686,096.02/138,601.80
  6. Step 6: Final answer
    x = 108,257.51

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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.