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Finding the Fourth Proportional to 123,978.36, 171,091.89 and 67,389.78

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Solution

The fourth proportional to 123,978.36, 171,091.89 and 67,389.78 is: 92,998.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,978.36 : 171,091.89 = 67,389.78 : x
  2. Step 2: Convert to fraction form
    123,978.36/171,091.89 = 67,389.78/x
  3. Step 3: Cross multiply
    123,978.36x = 171,091.89 × 67,389.78
  4. Step 4: Simplify right side
    123,978.36x = 11,529,844,826.88
  5. Step 5: Solve for x
    x = 11,529,844,826.88/123,978.36
  6. Step 6: Final answer
    x = 92,998.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.