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Finding the Fourth Proportional to 19,919.40, 29,879.10 and 5,879.62

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Solution

The fourth proportional to 19,919.40, 29,879.10 and 5,879.62 is: 8,819.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,919.40 : 29,879.10 = 5,879.62 : x
  2. Step 2: Convert to fraction form
    19,919.40/29,879.10 = 5,879.62/x
  3. Step 3: Cross multiply
    19,919.40x = 29,879.10 × 5,879.62
  4. Step 4: Simplify right side
    19,919.40x = 175,677,753.94
  5. Step 5: Solve for x
    x = 175,677,753.94/19,919.40
  6. Step 6: Final answer
    x = 8,819.43

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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.