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Finding the Fourth Proportional to 20,392.21, 30,579.99 and 7,909.84

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Solution

The fourth proportional to 20,392.21, 30,579.99 and 7,909.84 is: 11,861.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,392.21 : 30,579.99 = 7,909.84 : x
  2. Step 2: Convert to fraction form
    20,392.21/30,579.99 = 7,909.84/x
  3. Step 3: Cross multiply
    20,392.21x = 30,579.99 × 7,909.84
  4. Step 4: Simplify right side
    20,392.21x = 241,882,828.10
  5. Step 5: Solve for x
    x = 241,882,828.10/20,392.21
  6. Step 6: Final answer
    x = 11,861.53

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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.