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Finding the Fourth Proportional to 13,879.84, 20,811.12 and 6,481.12

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Solution

The fourth proportional to 13,879.84, 20,811.12 and 6,481.12 is: 9,717.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,879.84 : 20,811.12 = 6,481.12 : x
  2. Step 2: Convert to fraction form
    13,879.84/20,811.12 = 6,481.12/x
  3. Step 3: Cross multiply
    13,879.84x = 20,811.12 × 6,481.12
  4. Step 4: Simplify right side
    13,879.84x = 134,879,366.05
  5. Step 5: Solve for x
    x = 134,879,366.05/13,879.84
  6. Step 6: Final answer
    x = 9,717.65

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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.