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Finding the Fourth Proportional to 327.75, 491.40 and 212.91

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Solution

The fourth proportional to 327.75, 491.40 and 212.91 is: 319.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    327.75 : 491.40 = 212.91 : x
  2. Step 2: Convert to fraction form
    327.75/491.40 = 212.91/x
  3. Step 3: Cross multiply
    327.75x = 491.40 × 212.91
  4. Step 4: Simplify right side
    327.75x = 104,623.97
  5. Step 5: Solve for x
    x = 104,623.97/327.75
  6. Step 6: Final answer
    x = 319.22

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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.