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Finding the Fourth Proportional to 327.78, 490.80 and 259.44

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Solution

The fourth proportional to 327.78, 490.80 and 259.44 is: 388.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    327.78 : 490.80 = 259.44 : x
  2. Step 2: Convert to fraction form
    327.78/490.80 = 259.44/x
  3. Step 3: Cross multiply
    327.78x = 490.80 × 259.44
  4. Step 4: Simplify right side
    327.78x = 127,333.15
  5. Step 5: Solve for x
    x = 127,333.15/327.78
  6. Step 6: Final answer
    x = 388.47

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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.