Home / 21,305,380.80-31,939,408.80-12,789,105.60

Finding the Fourth Proportional to 21,305,380.80, 31,939,408.80 and 12,789,105.60

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Solution

The fourth proportional to 21,305,380.80, 31,939,408.80 and 12,789,105.60 is: 19,172,455.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,305,380.80 : 31,939,408.80 = 12,789,105.60 : x
  2. Step 2: Convert to fraction form
    21,305,380.80/31,939,408.80 = 12,789,105.60/x
  3. Step 3: Cross multiply
    21,305,380.80x = 31,939,408.80 × 12,789,105.60
  4. Step 4: Simplify right side
    21,305,380.80x = 408,476,471,944,769.25
  5. Step 5: Solve for x
    x = 408,476,471,944,769.25/21,305,380.80
  6. Step 6: Final answer
    x = 19,172,455.81

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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.