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Finding the Fourth Proportional to 18,043.36, 27,078 and 11,122.72

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Solution

The fourth proportional to 18,043.36, 27,078 and 11,122.72 is: 16,692.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,043.36 : 27,078 = 11,122.72 : x
  2. Step 2: Convert to fraction form
    18,043.36/27,078 = 11,122.72/x
  3. Step 3: Cross multiply
    18,043.36x = 27,078 × 11,122.72
  4. Step 4: Simplify right side
    18,043.36x = 301,181,012.16
  5. Step 5: Solve for x
    x = 301,181,012.16/18,043.36
  6. Step 6: Final answer
    x = 16,692.07

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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.