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Finding the Fourth Proportional to 68,679,857.60, 103,019,786.40 and 20,804,580.80

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Solution

The fourth proportional to 68,679,857.60, 103,019,786.40 and 20,804,580.80 is: 31,206,871.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,679,857.60 : 103,019,786.40 = 20,804,580.80 : x
  2. Step 2: Convert to fraction form
    68,679,857.60/103,019,786.40 = 20,804,580.80/x
  3. Step 3: Cross multiply
    68,679,857.60x = 103,019,786.40 × 20,804,580.80
  4. Step 4: Simplify right side
    68,679,857.60x = 2,143,283,470,157,541.25
  5. Step 5: Solve for x
    x = 2,143,283,470,157,541.25/68,679,857.60
  6. Step 6: Final answer
    x = 31,206,871.20

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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.