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Finding the Fourth Proportional to 20,599.20, 30,913.20 and 8,920.80

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Solution

The fourth proportional to 20,599.20, 30,913.20 and 8,920.80 is: 13,387.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,599.20 : 30,913.20 = 8,920.80 : x
  2. Step 2: Convert to fraction form
    20,599.20/30,913.20 = 8,920.80/x
  3. Step 3: Cross multiply
    20,599.20x = 30,913.20 × 8,920.80
  4. Step 4: Simplify right side
    20,599.20x = 275,770,474.56
  5. Step 5: Solve for x
    x = 275,770,474.56/20,599.20
  6. Step 6: Final answer
    x = 13,387.44

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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.