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Finding the Fourth Proportional to 19,872.99, 29,809.38 and 5,081.88

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Solution

The fourth proportional to 19,872.99, 29,809.38 and 5,081.88 is: 7,622.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,872.99 : 29,809.38 = 5,081.88 : x
  2. Step 2: Convert to fraction form
    19,872.99/29,809.38 = 5,081.88/x
  3. Step 3: Cross multiply
    19,872.99x = 29,809.38 × 5,081.88
  4. Step 4: Simplify right side
    19,872.99x = 151,487,692.03
  5. Step 5: Solve for x
    x = 151,487,692.03/19,872.99
  6. Step 6: Final answer
    x = 7,622.79

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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.