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Finding the Fourth Proportional to 20,179.60, 30,269.40 and 12,392.80

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Solution

The fourth proportional to 20,179.60, 30,269.40 and 12,392.80 is: 18,589.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,179.60 : 30,269.40 = 12,392.80 : x
  2. Step 2: Convert to fraction form
    20,179.60/30,269.40 = 12,392.80/x
  3. Step 3: Cross multiply
    20,179.60x = 30,269.40 × 12,392.80
  4. Step 4: Simplify right side
    20,179.60x = 375,122,620.32
  5. Step 5: Solve for x
    x = 375,122,620.32/20,179.60
  6. Step 6: Final answer
    x = 18,589.20

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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.