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Finding the Fourth Proportional to 994.18, 1,491.75 and 409.61

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Solution

The fourth proportional to 994.18, 1,491.75 and 409.61 is: 614.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.18 : 1,491.75 = 409.61 : x
  2. Step 2: Convert to fraction form
    994.18/1,491.75 = 409.61/x
  3. Step 3: Cross multiply
    994.18x = 1,491.75 × 409.61
  4. Step 4: Simplify right side
    994.18x = 611,035.72
  5. Step 5: Solve for x
    x = 611,035.72/994.18
  6. Step 6: Final answer
    x = 614.61

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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.