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Finding the Fourth Proportional to 994.05, 1,491.98 and 789.21

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Solution

The fourth proportional to 994.05, 1,491.98 and 789.21 is: 1,184.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.05 : 1,491.98 = 789.21 : x
  2. Step 2: Convert to fraction form
    994.05/1,491.98 = 789.21/x
  3. Step 3: Cross multiply
    994.05x = 1,491.98 × 789.21
  4. Step 4: Simplify right side
    994.05x = 1,177,481.59
  5. Step 5: Solve for x
    x = 1,177,481.59/994.05
  6. Step 6: Final answer
    x = 1,184.53

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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.