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Finding the Fourth Proportional to 1,105.75, 1,658.49 and 412.44

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Solution

The fourth proportional to 1,105.75, 1,658.49 and 412.44 is: 618.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,105.75 : 1,658.49 = 412.44 : x
  2. Step 2: Convert to fraction form
    1,105.75/1,658.49 = 412.44/x
  3. Step 3: Cross multiply
    1,105.75x = 1,658.49 × 412.44
  4. Step 4: Simplify right side
    1,105.75x = 684,029.16
  5. Step 5: Solve for x
    x = 684,029.16/1,105.75
  6. Step 6: Final answer
    x = 618.61

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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.