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Finding the Fourth Proportional to 18,940.64, 26,138.14 and 11,391.30

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Solution

The fourth proportional to 18,940.64, 26,138.14 and 11,391.30 is: 15,720.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,940.64 : 26,138.14 = 11,391.30 : x
  2. Step 2: Convert to fraction form
    18,940.64/26,138.14 = 11,391.30/x
  3. Step 3: Cross multiply
    18,940.64x = 26,138.14 × 11,391.30
  4. Step 4: Simplify right side
    18,940.64x = 297,747,394.18
  5. Step 5: Solve for x
    x = 297,747,394.18/18,940.64
  6. Step 6: Final answer
    x = 15,720.03

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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.