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Finding the Fourth Proportional to 18,510.78, 27,765.60 and 8,122.56

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Solution

The fourth proportional to 18,510.78, 27,765.60 and 8,122.56 is: 12,183.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,510.78 : 27,765.60 = 8,122.56 : x
  2. Step 2: Convert to fraction form
    18,510.78/27,765.60 = 8,122.56/x
  3. Step 3: Cross multiply
    18,510.78x = 27,765.60 × 8,122.56
  4. Step 4: Simplify right side
    18,510.78x = 225,527,751.94
  5. Step 5: Solve for x
    x = 225,527,751.94/18,510.78
  6. Step 6: Final answer
    x = 12,183.59

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1.5x scale

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.