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Finding the Fourth Proportional to 68,950,842.30, 103,426,263.45 and 21,081,786.30

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Solution

The fourth proportional to 68,950,842.30, 103,426,263.45 and 21,081,786.30 is: 31,622,679.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,950,842.30 : 103,426,263.45 = 21,081,786.30 : x
  2. Step 2: Convert to fraction form
    68,950,842.30/103,426,263.45 = 21,081,786.30/x
  3. Step 3: Cross multiply
    68,950,842.30x = 103,426,263.45 × 21,081,786.30
  4. Step 4: Simplify right side
    68,950,842.30x = 2,180,410,383,860,400.75
  5. Step 5: Solve for x
    x = 2,180,410,383,860,400.75/68,950,842.30
  6. Step 6: Final answer
    x = 31,622,679.45

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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.