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Finding the Fourth Proportional to 20,065.40, 30,108.90 and 8,379.80

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Solution

The fourth proportional to 20,065.40, 30,108.90 and 8,379.80 is: 12,574.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,065.40 : 30,108.90 = 8,379.80 : x
  2. Step 2: Convert to fraction form
    20,065.40/30,108.90 = 8,379.80/x
  3. Step 3: Cross multiply
    20,065.40x = 30,108.90 × 8,379.80
  4. Step 4: Simplify right side
    20,065.40x = 252,306,560.22
  5. Step 5: Solve for x
    x = 252,306,560.22/20,065.40
  6. Step 6: Final answer
    x = 12,574.21

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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.