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Finding the Fourth Proportional to 20,079.40, 30,129.90 and 8,393.80

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Solution

The fourth proportional to 20,079.40, 30,129.90 and 8,393.80 is: 12,595.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,079.40 : 30,129.90 = 8,393.80 : x
  2. Step 2: Convert to fraction form
    20,079.40/30,129.90 = 8,393.80/x
  3. Step 3: Cross multiply
    20,079.40x = 30,129.90 × 8,393.80
  4. Step 4: Simplify right side
    20,079.40x = 252,904,354.62
  5. Step 5: Solve for x
    x = 252,904,354.62/20,079.40
  6. Step 6: Final answer
    x = 12,595.21

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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.