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Finding the Fourth Proportional to 66,435,939.60, 99,644,578.20 and 21,002,326.80

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Solution

The fourth proportional to 66,435,939.60, 99,644,578.20 and 21,002,326.80 is: 31,500,540.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,435,939.60 : 99,644,578.20 = 21,002,326.80 : x
  2. Step 2: Convert to fraction form
    66,435,939.60/99,644,578.20 = 21,002,326.80/x
  3. Step 3: Cross multiply
    66,435,939.60x = 99,644,578.20 × 21,002,326.80
  4. Step 4: Simplify right side
    66,435,939.60x = 2,092,767,995,204,556
  5. Step 5: Solve for x
    x = 2,092,767,995,204,556/66,435,939.60
  6. Step 6: Final answer
    x = 31,500,540.34

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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.