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Finding the Fourth Proportional to 68,881.89, 103,310.70 and 18,949.93

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Solution

The fourth proportional to 68,881.89, 103,310.70 and 18,949.93 is: 28,421.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,881.89 : 103,310.70 = 18,949.93 : x
  2. Step 2: Convert to fraction form
    68,881.89/103,310.70 = 18,949.93/x
  3. Step 3: Cross multiply
    68,881.89x = 103,310.70 × 18,949.93
  4. Step 4: Simplify right side
    68,881.89x = 1,957,730,533.25
  5. Step 5: Solve for x
    x = 1,957,730,533.25/68,881.89
  6. Step 6: Final answer
    x = 28,421.56

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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.