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Finding the Fourth Proportional to 205,355.20, 308,078.70 and 72,239.80

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Solution

The fourth proportional to 205,355.20, 308,078.70 and 72,239.80 is: 108,375.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,355.20 : 308,078.70 = 72,239.80 : x
  2. Step 2: Convert to fraction form
    205,355.20/308,078.70 = 72,239.80/x
  3. Step 3: Cross multiply
    205,355.20x = 308,078.70 × 72,239.80
  4. Step 4: Simplify right side
    205,355.20x = 22,255,543,672.26
  5. Step 5: Solve for x
    x = 22,255,543,672.26/205,355.20
  6. Step 6: Final answer
    x = 108,375.85

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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.