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Finding the Fourth Proportional to 43,872.80, 65,816.09 and 18,919.94

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Solution

The fourth proportional to 43,872.80, 65,816.09 and 18,919.94 is: 28,382.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,872.80 : 65,816.09 = 18,919.94 : x
  2. Step 2: Convert to fraction form
    43,872.80/65,816.09 = 18,919.94/x
  3. Step 3: Cross multiply
    43,872.80x = 65,816.09 × 18,919.94
  4. Step 4: Simplify right side
    43,872.80x = 1,245,236,543.78
  5. Step 5: Solve for x
    x = 1,245,236,543.78/43,872.80
  6. Step 6: Final answer
    x = 28,382.88

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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.