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Finding the Fourth Proportional to 13,872.80, 20,811.90 and 4,012.40

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Solution

The fourth proportional to 13,872.80, 20,811.90 and 4,012.40 is: 6,019.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,872.80 : 20,811.90 = 4,012.40 : x
  2. Step 2: Convert to fraction form
    13,872.80/20,811.90 = 4,012.40/x
  3. Step 3: Cross multiply
    13,872.80x = 20,811.90 × 4,012.40
  4. Step 4: Simplify right side
    13,872.80x = 83,505,667.56
  5. Step 5: Solve for x
    x = 83,505,667.56/13,872.80
  6. Step 6: Final answer
    x = 6,019.38

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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.