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Finding the Fourth Proportional to 205,474.60, 308,270.94 and 85,508.20

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Solution

The fourth proportional to 205,474.60, 308,270.94 and 85,508.20 is: 128,286.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,474.60 : 308,270.94 = 85,508.20 : x
  2. Step 2: Convert to fraction form
    205,474.60/308,270.94 = 85,508.20/x
  3. Step 3: Cross multiply
    205,474.60x = 308,270.94 × 85,508.20
  4. Step 4: Simplify right side
    205,474.60x = 26,359,693,191.71
  5. Step 5: Solve for x
    x = 26,359,693,191.71/205,474.60
  6. Step 6: Final answer
    x = 128,286.87

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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.