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Finding the Fourth Proportional to 20,818.50, 31,227.78 and 8,506.50

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Solution

The fourth proportional to 20,818.50, 31,227.78 and 8,506.50 is: 12,759.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,818.50 : 31,227.78 = 8,506.50 : x
  2. Step 2: Convert to fraction form
    20,818.50/31,227.78 = 8,506.50/x
  3. Step 3: Cross multiply
    20,818.50x = 31,227.78 × 8,506.50
  4. Step 4: Simplify right side
    20,818.50x = 265,639,110.57
  5. Step 5: Solve for x
    x = 265,639,110.57/20,818.50
  6. Step 6: Final answer
    x = 12,759.76

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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.