Home / 20,855.54-28,781.11-11,902.86

Finding the Fourth Proportional to 20,855.54, 28,781.11 and 11,902.86

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Solution

The fourth proportional to 20,855.54, 28,781.11 and 11,902.86 is: 16,426.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,855.54 : 28,781.11 = 11,902.86 : x
  2. Step 2: Convert to fraction form
    20,855.54/28,781.11 = 11,902.86/x
  3. Step 3: Cross multiply
    20,855.54x = 28,781.11 × 11,902.86
  4. Step 4: Simplify right side
    20,855.54x = 342,577,470.90
  5. Step 5: Solve for x
    x = 342,577,470.90/20,855.54
  6. Step 6: Final answer
    x = 16,426.21

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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.