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Finding the Fourth Proportional to 18,821.10, 28,227.60 and 8,291.10

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Solution

The fourth proportional to 18,821.10, 28,227.60 and 8,291.10 is: 12,434.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,821.10 : 28,227.60 = 8,291.10 : x
  2. Step 2: Convert to fraction form
    18,821.10/28,227.60 = 8,291.10/x
  3. Step 3: Cross multiply
    18,821.10x = 28,227.60 × 8,291.10
  4. Step 4: Simplify right side
    18,821.10x = 234,037,854.36
  5. Step 5: Solve for x
    x = 234,037,854.36/18,821.10
  6. Step 6: Final answer
    x = 12,434.87

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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.