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Finding the Fourth Proportional to 20,064.80, 30,091.80 and 8,375.60

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Solution

The fourth proportional to 20,064.80, 30,091.80 and 8,375.60 is: 12,561.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,064.80 : 30,091.80 = 8,375.60 : x
  2. Step 2: Convert to fraction form
    20,064.80/30,091.80 = 8,375.60/x
  3. Step 3: Cross multiply
    20,064.80x = 30,091.80 × 8,375.60
  4. Step 4: Simplify right side
    20,064.80x = 252,036,880.08
  5. Step 5: Solve for x
    x = 252,036,880.08/20,064.80
  6. Step 6: Final answer
    x = 12,561.15

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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.