Home / 20,138.20-30,209.12-8,289.21

Finding the Fourth Proportional to 20,138.20, 30,209.12 and 8,289.21

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Solution

The fourth proportional to 20,138.20, 30,209.12 and 8,289.21 is: 12,434.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,138.20 : 30,209.12 = 8,289.21 : x
  2. Step 2: Convert to fraction form
    20,138.20/30,209.12 = 8,289.21/x
  3. Step 3: Cross multiply
    20,138.20x = 30,209.12 × 8,289.21
  4. Step 4: Simplify right side
    20,138.20x = 250,409,739.60
  5. Step 5: Solve for x
    x = 250,409,739.60/20,138.20
  6. Step 6: Final answer
    x = 12,434.56

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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.