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Finding the Fourth Proportional to 986, 1,479.27 and 408.88

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Solution

The fourth proportional to 986, 1,479.27 and 408.88 is: 613.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    986 : 1,479.27 = 408.88 : x
  2. Step 2: Convert to fraction form
    986/1,479.27 = 408.88/x
  3. Step 3: Cross multiply
    986x = 1,479.27 × 408.88
  4. Step 4: Simplify right side
    986x = 604,836.52
  5. Step 5: Solve for x
    x = 604,836.52/986
  6. Step 6: Final answer
    x = 613.42

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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.