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Finding the Fourth Proportional to 20,469.60, 30,688.20 and 11,235.60

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Solution

The fourth proportional to 20,469.60, 30,688.20 and 11,235.60 is: 16,844.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,469.60 : 30,688.20 = 11,235.60 : x
  2. Step 2: Convert to fraction form
    20,469.60/30,688.20 = 11,235.60/x
  3. Step 3: Cross multiply
    20,469.60x = 30,688.20 × 11,235.60
  4. Step 4: Simplify right side
    20,469.60x = 344,800,339.92
  5. Step 5: Solve for x
    x = 344,800,339.92/20,469.60
  6. Step 6: Final answer
    x = 16,844.51

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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.