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Finding the Fourth Proportional to 68,778.41, 103,165.18 and 18,857.71

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Solution

The fourth proportional to 68,778.41, 103,165.18 and 18,857.71 is: 28,285.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,778.41 : 103,165.18 = 18,857.71 : x
  2. Step 2: Convert to fraction form
    68,778.41/103,165.18 = 18,857.71/x
  3. Step 3: Cross multiply
    68,778.41x = 103,165.18 × 18,857.71
  4. Step 4: Simplify right side
    68,778.41x = 1,945,458,530.71
  5. Step 5: Solve for x
    x = 1,945,458,530.71/68,778.41
  6. Step 6: Final answer
    x = 28,285.89

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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.