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Finding the Fourth Proportional to 13,481.15, 20,121.90 and 12,650.09

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Solution

The fourth proportional to 13,481.15, 20,121.90 and 12,650.09 is: 18,881.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,481.15 : 20,121.90 = 12,650.09 : x
  2. Step 2: Convert to fraction form
    13,481.15/20,121.90 = 12,650.09/x
  3. Step 3: Cross multiply
    13,481.15x = 20,121.90 × 12,650.09
  4. Step 4: Simplify right side
    13,481.15x = 254,543,745.36
  5. Step 5: Solve for x
    x = 254,543,745.36/13,481.15
  6. Step 6: Final answer
    x = 18,881.46

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.