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Finding the Fourth Proportional to 994.22, 1,491.41 and 263.78

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Solution

The fourth proportional to 994.22, 1,491.41 and 263.78 is: 395.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.22 : 1,491.41 = 263.78 : x
  2. Step 2: Convert to fraction form
    994.22/1,491.41 = 263.78/x
  3. Step 3: Cross multiply
    994.22x = 1,491.41 × 263.78
  4. Step 4: Simplify right side
    994.22x = 393,406.54
  5. Step 5: Solve for x
    x = 393,406.54/994.22
  6. Step 6: Final answer
    x = 395.69

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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.