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Finding the Fourth Proportional to 18,245.78, 25,183.92 and 11,889.80

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Solution

The fourth proportional to 18,245.78, 25,183.92 and 11,889.80 is: 16,411.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,245.78 : 25,183.92 = 11,889.80 : x
  2. Step 2: Convert to fraction form
    18,245.78/25,183.92 = 11,889.80/x
  3. Step 3: Cross multiply
    18,245.78x = 25,183.92 × 11,889.80
  4. Step 4: Simplify right side
    18,245.78x = 299,431,772.02
  5. Step 5: Solve for x
    x = 299,431,772.02/18,245.78
  6. Step 6: Final answer
    x = 16,411.02

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1.5x scale

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.