Home / 20,638.86-28,481.22-12,141.90

Finding the Fourth Proportional to 20,638.86, 28,481.22 and 12,141.90

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Solution

The fourth proportional to 20,638.86, 28,481.22 and 12,141.90 is: 16,755.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,638.86 : 28,481.22 = 12,141.90 : x
  2. Step 2: Convert to fraction form
    20,638.86/28,481.22 = 12,141.90/x
  3. Step 3: Cross multiply
    20,638.86x = 28,481.22 × 12,141.90
  4. Step 4: Simplify right side
    20,638.86x = 345,816,125.12
  5. Step 5: Solve for x
    x = 345,816,125.12/20,638.86
  6. Step 6: Final answer
    x = 16,755.58

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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.