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Finding the Fourth Proportional to 994.06, 1,491.01 and 408.90

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Solution

The fourth proportional to 994.06, 1,491.01 and 408.90 is: 613.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.06 : 1,491.01 = 408.90 : x
  2. Step 2: Convert to fraction form
    994.06/1,491.01 = 408.90/x
  3. Step 3: Cross multiply
    994.06x = 1,491.01 × 408.90
  4. Step 4: Simplify right side
    994.06x = 609,674.50
  5. Step 5: Solve for x
    x = 609,674.50/994.06
  6. Step 6: Final answer
    x = 613.32

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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.