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Finding the Fourth Proportional to 68,859, 103,305.78 and 19,611

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Solution

The fourth proportional to 68,859, 103,305.78 and 19,611 is: 29,421.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,859 : 103,305.78 = 19,611 : x
  2. Step 2: Convert to fraction form
    68,859/103,305.78 = 19,611/x
  3. Step 3: Cross multiply
    68,859x = 103,305.78 × 19,611
  4. Step 4: Simplify right side
    68,859x = 2,025,929,651.58
  5. Step 5: Solve for x
    x = 2,025,929,651.58/68,859
  6. Step 6: Final answer
    x = 29,421.42

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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.