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Finding the Fourth Proportional to 13,878, 20,816.84 and 3,489.84

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Solution

The fourth proportional to 13,878, 20,816.84 and 3,489.84 is: 5,234.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,878 : 20,816.84 = 3,489.84 : x
  2. Step 2: Convert to fraction form
    13,878/20,816.84 = 3,489.84/x
  3. Step 3: Cross multiply
    13,878x = 20,816.84 × 3,489.84
  4. Step 4: Simplify right side
    13,878x = 72,647,440.91
  5. Step 5: Solve for x
    x = 72,647,440.91/13,878
  6. Step 6: Final answer
    x = 5,234.72

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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.