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Finding the Fourth Proportional to 326.21, 489.39 and 109.78

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Solution

The fourth proportional to 326.21, 489.39 and 109.78 is: 164.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.21 : 489.39 = 109.78 : x
  2. Step 2: Convert to fraction form
    326.21/489.39 = 109.78/x
  3. Step 3: Cross multiply
    326.21x = 489.39 × 109.78
  4. Step 4: Simplify right side
    326.21x = 53,725.23
  5. Step 5: Solve for x
    x = 53,725.23/326.21
  6. Step 6: Final answer
    x = 164.70

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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.