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Finding the Fourth Proportional to 327.08, 490.75 and 211.75

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Solution

The fourth proportional to 327.08, 490.75 and 211.75 is: 317.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    327.08 : 490.75 = 211.75 : x
  2. Step 2: Convert to fraction form
    327.08/490.75 = 211.75/x
  3. Step 3: Cross multiply
    327.08x = 490.75 × 211.75
  4. Step 4: Simplify right side
    327.08x = 103,914.56
  5. Step 5: Solve for x
    x = 103,914.56/327.08
  6. Step 6: Final answer
    x = 317.70

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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.