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Finding the Fourth Proportional to 137,321.80, 206,104.20 and 81,091.60

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Solution

The fourth proportional to 137,321.80, 206,104.20 and 81,091.60 is: 121,709.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,321.80 : 206,104.20 = 81,091.60 : x
  2. Step 2: Convert to fraction form
    137,321.80/206,104.20 = 81,091.60/x
  3. Step 3: Cross multiply
    137,321.80x = 206,104.20 × 81,091.60
  4. Step 4: Simplify right side
    137,321.80x = 16,713,319,344.72
  5. Step 5: Solve for x
    x = 16,713,319,344.72/137,321.80
  6. Step 6: Final answer
    x = 121,709.15

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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.