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Finding the Fourth Proportional to 205,128.40, 307,865.40 and 80,558.80

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Solution

The fourth proportional to 205,128.40, 307,865.40 and 80,558.80 is: 120,906.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,128.40 : 307,865.40 = 80,558.80 : x
  2. Step 2: Convert to fraction form
    205,128.40/307,865.40 = 80,558.80/x
  3. Step 3: Cross multiply
    205,128.40x = 307,865.40 × 80,558.80
  4. Step 4: Simplify right side
    205,128.40x = 24,801,267,185.52
  5. Step 5: Solve for x
    x = 24,801,267,185.52/205,128.40
  6. Step 6: Final answer
    x = 120,906.06

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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.