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Finding the Fourth Proportional to 78,496,791.94, 117,735,914.94 and 20,993,519.80

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Solution

The fourth proportional to 78,496,791.94, 117,735,914.94 and 20,993,519.80 is: 31,487,799.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,496,791.94 : 117,735,914.94 = 20,993,519.80 : x
  2. Step 2: Convert to fraction form
    78,496,791.94/117,735,914.94 = 20,993,519.80/x
  3. Step 3: Cross multiply
    78,496,791.94x = 117,735,914.94 × 20,993,519.80
  4. Step 4: Simplify right side
    78,496,791.94x = 2,471,691,261,464,006
  5. Step 5: Solve for x
    x = 2,471,691,261,464,006/78,496,791.94
  6. Step 6: Final answer
    x = 31,487,799.70

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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.