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Finding the Fourth Proportional to 326.66, 489.96 and 121.22

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Solution

The fourth proportional to 326.66, 489.96 and 121.22 is: 181.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.66 : 489.96 = 121.22 : x
  2. Step 2: Convert to fraction form
    326.66/489.96 = 121.22/x
  3. Step 3: Cross multiply
    326.66x = 489.96 × 121.22
  4. Step 4: Simplify right side
    326.66x = 59,392.95
  5. Step 5: Solve for x
    x = 59,392.95/326.66
  6. Step 6: Final answer
    x = 181.82

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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.