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Finding the Fourth Proportional to 994.12, 1,491.72 and 409.44

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Solution

The fourth proportional to 994.12, 1,491.72 and 409.44 is: 614.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.12 : 1,491.72 = 409.44 : x
  2. Step 2: Convert to fraction form
    994.12/1,491.72 = 409.44/x
  3. Step 3: Cross multiply
    994.12x = 1,491.72 × 409.44
  4. Step 4: Simplify right side
    994.12x = 610,769.84
  5. Step 5: Solve for x
    x = 610,769.84/994.12
  6. Step 6: Final answer
    x = 614.38

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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.