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Finding the Fourth Proportional to 15,104.20, 20,844.06 and 8,390.44

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Solution

The fourth proportional to 15,104.20, 20,844.06 and 8,390.44 is: 11,578.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,104.20 : 20,844.06 = 8,390.44 : x
  2. Step 2: Convert to fraction form
    15,104.20/20,844.06 = 8,390.44/x
  3. Step 3: Cross multiply
    15,104.20x = 20,844.06 × 8,390.44
  4. Step 4: Simplify right side
    15,104.20x = 174,890,730.57
  5. Step 5: Solve for x
    x = 174,890,730.57/15,104.20
  6. Step 6: Final answer
    x = 11,578.95

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.