Home / 20,129.80-30,184.96-8,439.88

Finding the Fourth Proportional to 20,129.80, 30,184.96 and 8,439.88

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Solution

The fourth proportional to 20,129.80, 30,184.96 and 8,439.88 is: 12,655.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,129.80 : 30,184.96 = 8,439.88 : x
  2. Step 2: Convert to fraction form
    20,129.80/30,184.96 = 8,439.88/x
  3. Step 3: Cross multiply
    20,129.80x = 30,184.96 × 8,439.88
  4. Step 4: Simplify right side
    20,129.80x = 254,757,440.20
  5. Step 5: Solve for x
    x = 254,757,440.20/20,129.80
  6. Step 6: Final answer
    x = 12,655.74

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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.