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Finding the Fourth Proportional to 79,970.44, 119,958.92 and 20,811.28

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Solution

The fourth proportional to 79,970.44, 119,958.92 and 20,811.28 is: 31,217.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,970.44 : 119,958.92 = 20,811.28 : x
  2. Step 2: Convert to fraction form
    79,970.44/119,958.92 = 20,811.28/x
  3. Step 3: Cross multiply
    79,970.44x = 119,958.92 × 20,811.28
  4. Step 4: Simplify right side
    79,970.44x = 2,496,498,672.62
  5. Step 5: Solve for x
    x = 2,496,498,672.62/79,970.44
  6. Step 6: Final answer
    x = 31,217.77

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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.