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Finding the Fourth Proportional to 20,620.98, 30,923.78 and 8,136.86

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Solution

The fourth proportional to 20,620.98, 30,923.78 and 8,136.86 is: 12,202.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,620.98 : 30,923.78 = 8,136.86 : x
  2. Step 2: Convert to fraction form
    20,620.98/30,923.78 = 8,136.86/x
  3. Step 3: Cross multiply
    20,620.98x = 30,923.78 × 8,136.86
  4. Step 4: Simplify right side
    20,620.98x = 251,622,273.23
  5. Step 5: Solve for x
    x = 251,622,273.23/20,620.98
  6. Step 6: Final answer
    x = 12,202.25

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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.