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Finding the Fourth Proportional to 68,940.64, 103,311.84 and 39,297.36

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Solution

The fourth proportional to 68,940.64, 103,311.84 and 39,297.36 is: 58,889.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,940.64 : 103,311.84 = 39,297.36 : x
  2. Step 2: Convert to fraction form
    68,940.64/103,311.84 = 39,297.36/x
  3. Step 3: Cross multiply
    68,940.64x = 103,311.84 × 39,297.36
  4. Step 4: Simplify right side
    68,940.64x = 4,059,882,568.74
  5. Step 5: Solve for x
    x = 4,059,882,568.74/68,940.64
  6. Step 6: Final answer
    x = 58,889.54

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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.