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Finding the Fourth Proportional to 205,481.80, 308,222.70 and 72,512.20

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Solution

The fourth proportional to 205,481.80, 308,222.70 and 72,512.20 is: 108,768.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,481.80 : 308,222.70 = 72,512.20 : x
  2. Step 2: Convert to fraction form
    205,481.80/308,222.70 = 72,512.20/x
  3. Step 3: Cross multiply
    205,481.80x = 308,222.70 × 72,512.20
  4. Step 4: Simplify right side
    205,481.80x = 22,349,906,066.94
  5. Step 5: Solve for x
    x = 22,349,906,066.94/205,481.80
  6. Step 6: Final answer
    x = 108,768.30

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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.