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Finding the Fourth Proportional to 139,969,203.70, 209,953,805.55 and 82,431,858.10

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Solution

The fourth proportional to 139,969,203.70, 209,953,805.55 and 82,431,858.10 is: 123,647,787.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,969,203.70 : 209,953,805.55 = 82,431,858.10 : x
  2. Step 2: Convert to fraction form
    139,969,203.70/209,953,805.55 = 82,431,858.10/x
  3. Step 3: Cross multiply
    139,969,203.70x = 209,953,805.55 × 82,431,858.10
  4. Step 4: Simplify right side
    139,969,203.70x = 17,306,882,306,652,592
  5. Step 5: Solve for x
    x = 17,306,882,306,652,592/139,969,203.70
  6. Step 6: Final answer
    x = 123,647,787.15

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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.