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Finding the Fourth Proportional to 258,920.40, 388,380.60 and 81,481.80

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Solution

The fourth proportional to 258,920.40, 388,380.60 and 81,481.80 is: 122,222.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,920.40 : 388,380.60 = 81,481.80 : x
  2. Step 2: Convert to fraction form
    258,920.40/388,380.60 = 81,481.80/x
  3. Step 3: Cross multiply
    258,920.40x = 388,380.60 × 81,481.80
  4. Step 4: Simplify right side
    258,920.40x = 31,645,950,373.08
  5. Step 5: Solve for x
    x = 31,645,950,373.08/258,920.40
  6. Step 6: Final answer
    x = 122,222.70

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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.