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Finding the Fourth Proportional to 986.29, 1,479.49 and 255.85

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Solution

The fourth proportional to 986.29, 1,479.49 and 255.85 is: 383.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.29 : 1,479.49 = 255.85 : x
  2. Step 2: Convert to fraction form
    986.29/1,479.49 = 255.85/x
  3. Step 3: Cross multiply
    986.29x = 1,479.49 × 255.85
  4. Step 4: Simplify right side
    986.29x = 378,519.48
  5. Step 5: Solve for x
    x = 378,519.48/986.29
  6. Step 6: Final answer
    x = 383.78

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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.