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Finding the Fourth Proportional to 18,789.92, 25,912.20 and 11,235.03

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Solution

The fourth proportional to 18,789.92, 25,912.20 and 11,235.03 is: 15,493.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,789.92 : 25,912.20 = 11,235.03 : x
  2. Step 2: Convert to fraction form
    18,789.92/25,912.20 = 11,235.03/x
  3. Step 3: Cross multiply
    18,789.92x = 25,912.20 × 11,235.03
  4. Step 4: Simplify right side
    18,789.92x = 291,124,289.33
  5. Step 5: Solve for x
    x = 291,124,289.33/18,789.92
  6. Step 6: Final answer
    x = 15,493.64

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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.