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Finding the Fourth Proportional to 19,221.46, 28,836.09 and 8,128.13

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Solution

The fourth proportional to 19,221.46, 28,836.09 and 8,128.13 is: 12,193.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,221.46 : 28,836.09 = 8,128.13 : x
  2. Step 2: Convert to fraction form
    19,221.46/28,836.09 = 8,128.13/x
  3. Step 3: Cross multiply
    19,221.46x = 28,836.09 × 8,128.13
  4. Step 4: Simplify right side
    19,221.46x = 234,383,488.21
  5. Step 5: Solve for x
    x = 234,383,488.21/19,221.46
  6. Step 6: Final answer
    x = 12,193.84

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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.