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Finding the Fourth Proportional to 986.09, 1,479.21 and 327.83

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Solution

The fourth proportional to 986.09, 1,479.21 and 327.83 is: 491.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.09 : 1,479.21 = 327.83 : x
  2. Step 2: Convert to fraction form
    986.09/1,479.21 = 327.83/x
  3. Step 3: Cross multiply
    986.09x = 1,479.21 × 327.83
  4. Step 4: Simplify right side
    986.09x = 484,922.02
  5. Step 5: Solve for x
    x = 484,922.02/986.09
  6. Step 6: Final answer
    x = 491.76

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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.