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Finding the Fourth Proportional to 20,491,893.82, 28,278,841.03 and 11,789,891.90

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Solution

The fourth proportional to 20,491,893.82, 28,278,841.03 and 11,789,891.90 is: 16,270,066.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,491,893.82 : 28,278,841.03 = 11,789,891.90 : x
  2. Step 2: Convert to fraction form
    20,491,893.82/28,278,841.03 = 11,789,891.90/x
  3. Step 3: Cross multiply
    20,491,893.82x = 28,278,841.03 × 11,789,891.90
  4. Step 4: Simplify right side
    20,491,893.82x = 333,404,478,830,459.38
  5. Step 5: Solve for x
    x = 333,404,478,830,459.38/20,491,893.82
  6. Step 6: Final answer
    x = 16,270,066.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.