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Finding the Fourth Proportional to 68,912.89, 103,372.86 and 18,991.88

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Solution

The fourth proportional to 68,912.89, 103,372.86 and 18,991.88 is: 28,488.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,912.89 : 103,372.86 = 18,991.88 : x
  2. Step 2: Convert to fraction form
    68,912.89/103,372.86 = 18,991.88/x
  3. Step 3: Cross multiply
    68,912.89x = 103,372.86 × 18,991.88
  4. Step 4: Simplify right side
    68,912.89x = 1,963,244,894.38
  5. Step 5: Solve for x
    x = 1,963,244,894.38/68,912.89
  6. Step 6: Final answer
    x = 28,488.79

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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.