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Finding the Fourth Proportional to 326.72, 490.14 and 211.16

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Solution

The fourth proportional to 326.72, 490.14 and 211.16 is: 316.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.72 : 490.14 = 211.16 : x
  2. Step 2: Convert to fraction form
    326.72/490.14 = 211.16/x
  3. Step 3: Cross multiply
    326.72x = 490.14 × 211.16
  4. Step 4: Simplify right side
    326.72x = 103,497.96
  5. Step 5: Solve for x
    x = 103,497.96/326.72
  6. Step 6: Final answer
    x = 316.78

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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.