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Finding the Fourth Proportional to 326.56, 489.84 and 164.21

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Solution

The fourth proportional to 326.56, 489.84 and 164.21 is: 246.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.56 : 489.84 = 164.21 : x
  2. Step 2: Convert to fraction form
    326.56/489.84 = 164.21/x
  3. Step 3: Cross multiply
    326.56x = 489.84 × 164.21
  4. Step 4: Simplify right side
    326.56x = 80,434.18
  5. Step 5: Solve for x
    x = 80,434.18/326.56
  6. Step 6: Final answer
    x = 246.31

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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.