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Finding the Fourth Proportional to 19,919.94, 29,879.64 and 6,781.47

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Solution

The fourth proportional to 19,919.94, 29,879.64 and 6,781.47 is: 10,172.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,919.94 : 29,879.64 = 6,781.47 : x
  2. Step 2: Convert to fraction form
    19,919.94/29,879.64 = 6,781.47/x
  3. Step 3: Cross multiply
    19,919.94x = 29,879.64 × 6,781.47
  4. Step 4: Simplify right side
    19,919.94x = 202,627,882.27
  5. Step 5: Solve for x
    x = 202,627,882.27/19,919.94
  6. Step 6: Final answer
    x = 10,172.11

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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.