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Finding the Fourth Proportional to 13,843.20, 20,764.80 and 8,313.60

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Solution

The fourth proportional to 13,843.20, 20,764.80 and 8,313.60 is: 12,470.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,843.20 : 20,764.80 = 8,313.60 : x
  2. Step 2: Convert to fraction form
    13,843.20/20,764.80 = 8,313.60/x
  3. Step 3: Cross multiply
    13,843.20x = 20,764.80 × 8,313.60
  4. Step 4: Simplify right side
    13,843.20x = 172,630,241.28
  5. Step 5: Solve for x
    x = 172,630,241.28/13,843.20
  6. Step 6: Final answer
    x = 12,470.40

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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.