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Finding the Fourth Proportional to 18,380.20, 27,555.44 and 7,129.73

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Solution

The fourth proportional to 18,380.20, 27,555.44 and 7,129.73 is: 10,688.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,380.20 : 27,555.44 = 7,129.73 : x
  2. Step 2: Convert to fraction form
    18,380.20/27,555.44 = 7,129.73/x
  3. Step 3: Cross multiply
    18,380.20x = 27,555.44 × 7,129.73
  4. Step 4: Simplify right side
    18,380.20x = 196,462,792.31
  5. Step 5: Solve for x
    x = 196,462,792.31/18,380.20
  6. Step 6: Final answer
    x = 10,688.83

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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.