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Finding the Fourth Proportional to 68,911.70, 103,369.64 and 18,992.61

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Solution

The fourth proportional to 68,911.70, 103,369.64 and 18,992.61 is: 28,489.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,911.70 : 103,369.64 = 18,992.61 : x
  2. Step 2: Convert to fraction form
    68,911.70/103,369.64 = 18,992.61/x
  3. Step 3: Cross multiply
    68,911.70x = 103,369.64 × 18,992.61
  4. Step 4: Simplify right side
    68,911.70x = 1,963,259,163.40
  5. Step 5: Solve for x
    x = 1,963,259,163.40/68,911.70
  6. Step 6: Final answer
    x = 28,489.49

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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.