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Finding the Fourth Proportional to 68,679,937.60, 103,019,906.40 and 20,804,660.80

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Solution

The fourth proportional to 68,679,937.60, 103,019,906.40 and 20,804,660.80 is: 31,206,991.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,679,937.60 : 103,019,906.40 = 20,804,660.80 : x
  2. Step 2: Convert to fraction form
    68,679,937.60/103,019,906.40 = 20,804,660.80/x
  3. Step 3: Cross multiply
    68,679,937.60x = 103,019,906.40 × 20,804,660.80
  4. Step 4: Simplify right side
    68,679,937.60x = 2,143,294,208,299,749.25
  5. Step 5: Solve for x
    x = 2,143,294,208,299,749.25/68,679,937.60
  6. Step 6: Final answer
    x = 31,206,991.20

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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.