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Finding the Fourth Proportional to 326.20, 489.36 and 120.84

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Solution

The fourth proportional to 326.20, 489.36 and 120.84 is: 181.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.20 : 489.36 = 120.84 : x
  2. Step 2: Convert to fraction form
    326.20/489.36 = 120.84/x
  3. Step 3: Cross multiply
    326.20x = 489.36 × 120.84
  4. Step 4: Simplify right side
    326.20x = 59,134.26
  5. Step 5: Solve for x
    x = 59,134.26/326.20
  6. Step 6: Final answer
    x = 181.28

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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.