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Finding the Fourth Proportional to 994.92, 1,491.36 and 409.80

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Solution

The fourth proportional to 994.92, 1,491.36 and 409.80 is: 614.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.92 : 1,491.36 = 409.80 : x
  2. Step 2: Convert to fraction form
    994.92/1,491.36 = 409.80/x
  3. Step 3: Cross multiply
    994.92x = 1,491.36 × 409.80
  4. Step 4: Simplify right side
    994.92x = 611,159.33
  5. Step 5: Solve for x
    x = 611,159.33/994.92
  6. Step 6: Final answer
    x = 614.28

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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.