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Finding the Fourth Proportional to 1,121.44, 1,682.35 and 381.03

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Solution

The fourth proportional to 1,121.44, 1,682.35 and 381.03 is: 571.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.44 : 1,682.35 = 381.03 : x
  2. Step 2: Convert to fraction form
    1,121.44/1,682.35 = 381.03/x
  3. Step 3: Cross multiply
    1,121.44x = 1,682.35 × 381.03
  4. Step 4: Simplify right side
    1,121.44x = 641,023.92
  5. Step 5: Solve for x
    x = 641,023.92/1,121.44
  6. Step 6: Final answer
    x = 571.61

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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.