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Finding the Fourth Proportional to 138,611.39, 207,939.48 and 54,325.82

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Solution

The fourth proportional to 138,611.39, 207,939.48 and 54,325.82 is: 81,497.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,611.39 : 207,939.48 = 54,325.82 : x
  2. Step 2: Convert to fraction form
    138,611.39/207,939.48 = 54,325.82/x
  3. Step 3: Cross multiply
    138,611.39x = 207,939.48 × 54,325.82
  4. Step 4: Simplify right side
    138,611.39x = 11,296,481,721.68
  5. Step 5: Solve for x
    x = 11,296,481,721.68/138,611.39
  6. Step 6: Final answer
    x = 81,497.50

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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.