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Finding the Fourth Proportional to 326.33, 489.51 and 120.89

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Solution

The fourth proportional to 326.33, 489.51 and 120.89 is: 181.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.33 : 489.51 = 120.89 : x
  2. Step 2: Convert to fraction form
    326.33/489.51 = 120.89/x
  3. Step 3: Cross multiply
    326.33x = 489.51 × 120.89
  4. Step 4: Simplify right side
    326.33x = 59,173.81
  5. Step 5: Solve for x
    x = 59,173.81/326.33
  6. Step 6: Final answer
    x = 181.33

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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.