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Finding the Fourth Proportional to 2,112.21, 3,168.92 and 878.99

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Solution

The fourth proportional to 2,112.21, 3,168.92 and 878.99 is: 1,318.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,112.21 : 3,168.92 = 878.99 : x
  2. Step 2: Convert to fraction form
    2,112.21/3,168.92 = 878.99/x
  3. Step 3: Cross multiply
    2,112.21x = 3,168.92 × 878.99
  4. Step 4: Simplify right side
    2,112.21x = 2,785,435.34
  5. Step 5: Solve for x
    x = 2,785,435.34/2,112.21
  6. Step 6: Final answer
    x = 1,318.73

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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.