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Finding the Fourth Proportional to 326.08, 489.21 and 120.75

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Solution

The fourth proportional to 326.08, 489.21 and 120.75 is: 181.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.08 : 489.21 = 120.75 : x
  2. Step 2: Convert to fraction form
    326.08/489.21 = 120.75/x
  3. Step 3: Cross multiply
    326.08x = 489.21 × 120.75
  4. Step 4: Simplify right side
    326.08x = 59,072.11
  5. Step 5: Solve for x
    x = 59,072.11/326.08
  6. Step 6: Final answer
    x = 181.16

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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.