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Finding the Fourth Proportional to 2,155.05, 3,232.61 and 694.21

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Solution

The fourth proportional to 2,155.05, 3,232.61 and 694.21 is: 1,041.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,155.05 : 3,232.61 = 694.21 : x
  2. Step 2: Convert to fraction form
    2,155.05/3,232.61 = 694.21/x
  3. Step 3: Cross multiply
    2,155.05x = 3,232.61 × 694.21
  4. Step 4: Simplify right side
    2,155.05x = 2,244,110.19
  5. Step 5: Solve for x
    x = 2,244,110.19/2,155.05
  6. Step 6: Final answer
    x = 1,041.33

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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.