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Finding the Fourth Proportional to 12,138.90, 18,171.90 and 10,826.70

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Solution

The fourth proportional to 12,138.90, 18,171.90 and 10,826.70 is: 16,207.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,138.90 : 18,171.90 = 10,826.70 : x
  2. Step 2: Convert to fraction form
    12,138.90/18,171.90 = 10,826.70/x
  3. Step 3: Cross multiply
    12,138.90x = 18,171.90 × 10,826.70
  4. Step 4: Simplify right side
    12,138.90x = 196,741,709.73
  5. Step 5: Solve for x
    x = 196,741,709.73/12,138.90
  6. Step 6: Final answer
    x = 16,207.54

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1.5x scale

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.