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Finding the Fourth Proportional to 205,989.40, 308,753.70 and 87,640.60

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Solution

The fourth proportional to 205,989.40, 308,753.70 and 87,640.60 is: 131,362.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,989.40 : 308,753.70 = 87,640.60 : x
  2. Step 2: Convert to fraction form
    205,989.40/308,753.70 = 87,640.60/x
  3. Step 3: Cross multiply
    205,989.40x = 308,753.70 × 87,640.60
  4. Step 4: Simplify right side
    205,989.40x = 27,059,359,520.22
  5. Step 5: Solve for x
    x = 27,059,359,520.22/205,989.40
  6. Step 6: Final answer
    x = 131,362.87

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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.