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Finding the Fourth Proportional to 20,422.67, 30,620.90 and 8,584.11

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Solution

The fourth proportional to 20,422.67, 30,620.90 and 8,584.11 is: 12,870.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,422.67 : 30,620.90 = 8,584.11 : x
  2. Step 2: Convert to fraction form
    20,422.67/30,620.90 = 8,584.11/x
  3. Step 3: Cross multiply
    20,422.67x = 30,620.90 × 8,584.11
  4. Step 4: Simplify right side
    20,422.67x = 262,853,195.36
  5. Step 5: Solve for x
    x = 262,853,195.36/20,422.67
  6. Step 6: Final answer
    x = 12,870.66

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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.