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Finding the Fourth Proportional to 986.24, 1,479.33 and 255.79

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Solution

The fourth proportional to 986.24, 1,479.33 and 255.79 is: 383.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.24 : 1,479.33 = 255.79 : x
  2. Step 2: Convert to fraction form
    986.24/1,479.33 = 255.79/x
  3. Step 3: Cross multiply
    986.24x = 1,479.33 × 255.79
  4. Step 4: Simplify right side
    986.24x = 378,397.82
  5. Step 5: Solve for x
    x = 378,397.82/986.24
  6. Step 6: Final answer
    x = 383.68

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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.