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Finding the Fourth Proportional to 68,991.92, 103,455.12 and 31,540.88

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Solution

The fourth proportional to 68,991.92, 103,455.12 and 31,540.88 is: 47,296.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,991.92 : 103,455.12 = 31,540.88 : x
  2. Step 2: Convert to fraction form
    68,991.92/103,455.12 = 31,540.88/x
  3. Step 3: Cross multiply
    68,991.92x = 103,455.12 × 31,540.88
  4. Step 4: Simplify right side
    68,991.92x = 3,263,065,525.31
  5. Step 5: Solve for x
    x = 3,263,065,525.31/68,991.92
  6. Step 6: Final answer
    x = 47,296.34

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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.