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Finding the Fourth Proportional to 20,641.10, 28,481.90 and 12,138.21

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Solution

The fourth proportional to 20,641.10, 28,481.90 and 12,138.21 is: 16,749.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,641.10 : 28,481.90 = 12,138.21 : x
  2. Step 2: Convert to fraction form
    20,641.10/28,481.90 = 12,138.21/x
  3. Step 3: Cross multiply
    20,641.10x = 28,481.90 × 12,138.21
  4. Step 4: Simplify right side
    20,641.10x = 345,719,222.71
  5. Step 5: Solve for x
    x = 345,719,222.71/20,641.10
  6. Step 6: Final answer
    x = 16,749.07

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1.5x scale

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.