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Finding the Fourth Proportional to 68,019,806.80, 102,135,998.40 and 39,321,992.80

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Solution

The fourth proportional to 68,019,806.80, 102,135,998.40 and 39,321,992.80 is: 59,044,434.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,019,806.80 : 102,135,998.40 = 39,321,992.80 : x
  2. Step 2: Convert to fraction form
    68,019,806.80/102,135,998.40 = 39,321,992.80/x
  3. Step 3: Cross multiply
    68,019,806.80x = 102,135,998.40 × 39,321,992.80
  4. Step 4: Simplify right side
    68,019,806.80x = 4,016,190,993,705,611.50
  5. Step 5: Solve for x
    x = 4,016,190,993,705,611.50/68,019,806.80
  6. Step 6: Final answer
    x = 59,044,434.01

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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.