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Finding the Fourth Proportional to 18,631.92, 25,704.60 and 11,916

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Solution

The fourth proportional to 18,631.92, 25,704.60 and 11,916 is: 16,439.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,631.92 : 25,704.60 = 11,916 : x
  2. Step 2: Convert to fraction form
    18,631.92/25,704.60 = 11,916/x
  3. Step 3: Cross multiply
    18,631.92x = 25,704.60 × 11,916
  4. Step 4: Simplify right side
    18,631.92x = 306,296,013.60
  5. Step 5: Solve for x
    x = 306,296,013.60/18,631.92
  6. Step 6: Final answer
    x = 16,439.32

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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.