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Finding the Fourth Proportional to 68,479.39, 102,723.73 and 21,091.56

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Solution

The fourth proportional to 68,479.39, 102,723.73 and 21,091.56 is: 31,638.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,479.39 : 102,723.73 = 21,091.56 : x
  2. Step 2: Convert to fraction form
    68,479.39/102,723.73 = 21,091.56/x
  3. Step 3: Cross multiply
    68,479.39x = 102,723.73 × 21,091.56
  4. Step 4: Simplify right side
    68,479.39x = 2,166,603,201.10
  5. Step 5: Solve for x
    x = 2,166,603,201.10/68,479.39
  6. Step 6: Final answer
    x = 31,638.76

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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.