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Finding the Fourth Proportional to 994.28, 1,491.41 and 660.42

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Solution

The fourth proportional to 994.28, 1,491.41 and 660.42 is: 990.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.28 : 1,491.41 = 660.42 : x
  2. Step 2: Convert to fraction form
    994.28/1,491.41 = 660.42/x
  3. Step 3: Cross multiply
    994.28x = 1,491.41 × 660.42
  4. Step 4: Simplify right side
    994.28x = 984,958.64
  5. Step 5: Solve for x
    x = 984,958.64/994.28
  6. Step 6: Final answer
    x = 990.63

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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.