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Finding the Fourth Proportional to 326.15, 489.42 and 120.74

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Solution

The fourth proportional to 326.15, 489.42 and 120.74 is: 181.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.15 : 489.42 = 120.74 : x
  2. Step 2: Convert to fraction form
    326.15/489.42 = 120.74/x
  3. Step 3: Cross multiply
    326.15x = 489.42 × 120.74
  4. Step 4: Simplify right side
    326.15x = 59,092.57
  5. Step 5: Solve for x
    x = 59,092.57/326.15
  6. Step 6: Final answer
    x = 181.18

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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.