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Finding the Fourth Proportional to 2,153.43, 3,231.96 and 855.81

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Solution

The fourth proportional to 2,153.43, 3,231.96 and 855.81 is: 1,284.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,153.43 : 3,231.96 = 855.81 : x
  2. Step 2: Convert to fraction form
    2,153.43/3,231.96 = 855.81/x
  3. Step 3: Cross multiply
    2,153.43x = 3,231.96 × 855.81
  4. Step 4: Simplify right side
    2,153.43x = 2,765,943.69
  5. Step 5: Solve for x
    x = 2,765,943.69/2,153.43
  6. Step 6: Final answer
    x = 1,284.44

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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.