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Finding the Fourth Proportional to 258,936.40, 388,404.60 and 81,497.80

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Solution

The fourth proportional to 258,936.40, 388,404.60 and 81,497.80 is: 122,246.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,936.40 : 388,404.60 = 81,497.80 : x
  2. Step 2: Convert to fraction form
    258,936.40/388,404.60 = 81,497.80/x
  3. Step 3: Cross multiply
    258,936.40x = 388,404.60 × 81,497.80
  4. Step 4: Simplify right side
    258,936.40x = 31,654,120,409.88
  5. Step 5: Solve for x
    x = 31,654,120,409.88/258,936.40
  6. Step 6: Final answer
    x = 122,246.70

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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.