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Finding the Fourth Proportional to 13,843.10, 20,739.90 and 8,423.60

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Solution

The fourth proportional to 13,843.10, 20,739.90 and 8,423.60 is: 12,620.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,843.10 : 20,739.90 = 8,423.60 : x
  2. Step 2: Convert to fraction form
    13,843.10/20,739.90 = 8,423.60/x
  3. Step 3: Cross multiply
    13,843.10x = 20,739.90 × 8,423.60
  4. Step 4: Simplify right side
    13,843.10x = 174,704,621.64
  5. Step 5: Solve for x
    x = 174,704,621.64/13,843.10
  6. Step 6: Final answer
    x = 12,620.34

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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.