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Finding the Fourth Proportional to 18,761.76, 28,134.42 and 8,903.85

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Solution

The fourth proportional to 18,761.76, 28,134.42 and 8,903.85 is: 13,351.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,761.76 : 28,134.42 = 8,903.85 : x
  2. Step 2: Convert to fraction form
    18,761.76/28,134.42 = 8,903.85/x
  3. Step 3: Cross multiply
    18,761.76x = 28,134.42 × 8,903.85
  4. Step 4: Simplify right side
    18,761.76x = 250,504,655.52
  5. Step 5: Solve for x
    x = 250,504,655.52/18,761.76
  6. Step 6: Final answer
    x = 13,351.87

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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.