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Finding the Fourth Proportional to 66,427,507.60, 99,631,930.20 and 20,993,894.80

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Solution

The fourth proportional to 66,427,507.60, 99,631,930.20 and 20,993,894.80 is: 31,487,893.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,427,507.60 : 99,631,930.20 = 20,993,894.80 : x
  2. Step 2: Convert to fraction form
    66,427,507.60/99,631,930.20 = 20,993,894.80/x
  3. Step 3: Cross multiply
    66,427,507.60x = 99,631,930.20 × 20,993,894.80
  4. Step 4: Simplify right side
    66,427,507.60x = 2,091,662,261,339,743
  5. Step 5: Solve for x
    x = 2,091,662,261,339,743/66,427,507.60
  6. Step 6: Final answer
    x = 31,487,893.15

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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.