Home / 20,617.20-30,912.30-8,129.70

Finding the Fourth Proportional to 20,617.20, 30,912.30 and 8,129.70

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Solution

The fourth proportional to 20,617.20, 30,912.30 and 8,129.70 is: 12,189.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,617.20 : 30,912.30 = 8,129.70 : x
  2. Step 2: Convert to fraction form
    20,617.20/30,912.30 = 8,129.70/x
  3. Step 3: Cross multiply
    20,617.20x = 30,912.30 × 8,129.70
  4. Step 4: Simplify right side
    20,617.20x = 251,307,725.31
  5. Step 5: Solve for x
    x = 251,307,725.31/20,617.20
  6. Step 6: Final answer
    x = 12,189.23

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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.