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Finding the Fourth Proportional to 12,018.78, 18,027.99 and 3,698.91

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Solution

The fourth proportional to 12,018.78, 18,027.99 and 3,698.91 is: 5,548.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,018.78 : 18,027.99 = 3,698.91 : x
  2. Step 2: Convert to fraction form
    12,018.78/18,027.99 = 3,698.91/x
  3. Step 3: Cross multiply
    12,018.78x = 18,027.99 × 3,698.91
  4. Step 4: Simplify right side
    12,018.78x = 66,683,912.49
  5. Step 5: Solve for x
    x = 66,683,912.49/12,018.78
  6. Step 6: Final answer
    x = 5,548.31

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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.