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Finding the Fourth Proportional to 986.39, 1,479.26 and 328.09

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Solution

The fourth proportional to 986.39, 1,479.26 and 328.09 is: 492.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.39 : 1,479.26 = 328.09 : x
  2. Step 2: Convert to fraction form
    986.39/1,479.26 = 328.09/x
  3. Step 3: Cross multiply
    986.39x = 1,479.26 × 328.09
  4. Step 4: Simplify right side
    986.39x = 485,323.02
  5. Step 5: Solve for x
    x = 485,323.02/986.39
  6. Step 6: Final answer
    x = 492.02

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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.