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Finding the Fourth Proportional to 326.67, 489.90 and 121.29

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Solution

The fourth proportional to 326.67, 489.90 and 121.29 is: 181.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.67 : 489.90 = 121.29 : x
  2. Step 2: Convert to fraction form
    326.67/489.90 = 121.29/x
  3. Step 3: Cross multiply
    326.67x = 489.90 × 121.29
  4. Step 4: Simplify right side
    326.67x = 59,419.97
  5. Step 5: Solve for x
    x = 59,419.97/326.67
  6. Step 6: Final answer
    x = 181.90

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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.