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Finding the Fourth Proportional to 20,600.60, 30,900.90 and 12,824.60

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Solution

The fourth proportional to 20,600.60, 30,900.90 and 12,824.60 is: 19,236.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,600.60 : 30,900.90 = 12,824.60 : x
  2. Step 2: Convert to fraction form
    20,600.60/30,900.90 = 12,824.60/x
  3. Step 3: Cross multiply
    20,600.60x = 30,900.90 × 12,824.60
  4. Step 4: Simplify right side
    20,600.60x = 396,291,682.14
  5. Step 5: Solve for x
    x = 396,291,682.14/20,600.60
  6. Step 6: Final answer
    x = 19,236.90

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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.