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Finding the Fourth Proportional to 326.56, 489.64 and 218.16

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Solution

The fourth proportional to 326.56, 489.64 and 218.16 is: 327.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.56 : 489.64 = 218.16 : x
  2. Step 2: Convert to fraction form
    326.56/489.64 = 218.16/x
  3. Step 3: Cross multiply
    326.56x = 489.64 × 218.16
  4. Step 4: Simplify right side
    326.56x = 106,819.86
  5. Step 5: Solve for x
    x = 106,819.86/326.56
  6. Step 6: Final answer
    x = 327.11

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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.