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Finding the Fourth Proportional to 13,489.60, 20,212.80 and 8,867.20

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Solution

The fourth proportional to 13,489.60, 20,212.80 and 8,867.20 is: 13,286.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,489.60 : 20,212.80 = 8,867.20 : x
  2. Step 2: Convert to fraction form
    13,489.60/20,212.80 = 8,867.20/x
  3. Step 3: Cross multiply
    13,489.60x = 20,212.80 × 8,867.20
  4. Step 4: Simplify right side
    13,489.60x = 179,230,940.16
  5. Step 5: Solve for x
    x = 179,230,940.16/13,489.60
  6. Step 6: Final answer
    x = 13,286.60

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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.