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Finding the Fourth Proportional to 326.50, 489.44 and 120.90

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Solution

The fourth proportional to 326.50, 489.44 and 120.90 is: 181.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.50 : 489.44 = 120.90 : x
  2. Step 2: Convert to fraction form
    326.50/489.44 = 120.90/x
  3. Step 3: Cross multiply
    326.50x = 489.44 × 120.90
  4. Step 4: Simplify right side
    326.50x = 59,175.43
  5. Step 5: Solve for x
    x = 59,175.43/326.50
  6. Step 6: Final answer
    x = 181.24

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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.