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Finding the Fourth Proportional to 18,978.06, 26,198.60 and 11,018.73

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Solution

The fourth proportional to 18,978.06, 26,198.60 and 11,018.73 is: 15,211.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,978.06 : 26,198.60 = 11,018.73 : x
  2. Step 2: Convert to fraction form
    18,978.06/26,198.60 = 11,018.73/x
  3. Step 3: Cross multiply
    18,978.06x = 26,198.60 × 11,018.73
  4. Step 4: Simplify right side
    18,978.06x = 288,675,244.68
  5. Step 5: Solve for x
    x = 288,675,244.68/18,978.06
  6. Step 6: Final answer
    x = 15,211.00

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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.