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Finding the Fourth Proportional to 68,979,083.16, 103,468,998.78 and 20,457,357.78

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Solution

The fourth proportional to 68,979,083.16, 103,468,998.78 and 20,457,357.78 is: 30,686,147.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,979,083.16 : 103,468,998.78 = 20,457,357.78 : x
  2. Step 2: Convert to fraction form
    68,979,083.16/103,468,998.78 = 20,457,357.78/x
  3. Step 3: Cross multiply
    68,979,083.16x = 103,468,998.78 × 20,457,357.78
  4. Step 4: Simplify right side
    68,979,083.16x = 2,116,702,327,180,843.75
  5. Step 5: Solve for x
    x = 2,116,702,327,180,843.75/68,979,083.16
  6. Step 6: Final answer
    x = 30,686,147.60

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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.