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Finding the Fourth Proportional to 68,950,828.80, 103,426,243.20 and 21,081,772.80

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Solution

The fourth proportional to 68,950,828.80, 103,426,243.20 and 21,081,772.80 is: 31,622,659.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,950,828.80 : 103,426,243.20 = 21,081,772.80 : x
  2. Step 2: Convert to fraction form
    68,950,828.80/103,426,243.20 = 21,081,772.80/x
  3. Step 3: Cross multiply
    68,950,828.80x = 103,426,243.20 × 21,081,772.80
  4. Step 4: Simplify right side
    68,950,828.80x = 2,180,408,560,699,945
  5. Step 5: Solve for x
    x = 2,180,408,560,699,945/68,950,828.80
  6. Step 6: Final answer
    x = 31,622,659.20

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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.