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Finding the Fourth Proportional to 255.98, 383.99 and 219.69

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Solution

The fourth proportional to 255.98, 383.99 and 219.69 is: 329.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.98 : 383.99 = 219.69 : x
  2. Step 2: Convert to fraction form
    255.98/383.99 = 219.69/x
  3. Step 3: Cross multiply
    255.98x = 383.99 × 219.69
  4. Step 4: Simplify right side
    255.98x = 84,357.66
  5. Step 5: Solve for x
    x = 84,357.66/255.98
  6. Step 6: Final answer
    x = 329.54

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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.