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Finding the Fourth Proportional to 66,431,919.60, 99,647,879.40 and 20,993,714.10

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Solution

The fourth proportional to 66,431,919.60, 99,647,879.40 and 20,993,714.10 is: 31,490,571.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,431,919.60 : 99,647,879.40 = 20,993,714.10 : x
  2. Step 2: Convert to fraction form
    66,431,919.60/99,647,879.40 = 20,993,714.10/x
  3. Step 3: Cross multiply
    66,431,919.60x = 99,647,879.40 × 20,993,714.10
  4. Step 4: Simplify right side
    66,431,919.60x = 2,091,979,090,794,879.75
  5. Step 5: Solve for x
    x = 2,091,979,090,794,879.75/66,431,919.60
  6. Step 6: Final answer
    x = 31,490,571.15

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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.