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Finding the Fourth Proportional to 205,881.10, 308,836.05 and 81,205.90

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Solution

The fourth proportional to 205,881.10, 308,836.05 and 81,205.90 is: 121,814.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,881.10 : 308,836.05 = 81,205.90 : x
  2. Step 2: Convert to fraction form
    205,881.10/308,836.05 = 81,205.90/x
  3. Step 3: Cross multiply
    205,881.10x = 308,836.05 × 81,205.90
  4. Step 4: Simplify right side
    205,881.10x = 25,079,309,392.70
  5. Step 5: Solve for x
    x = 25,079,309,392.70/205,881.10
  6. Step 6: Final answer
    x = 121,814.53

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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.