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Finding the Fourth Proportional to 326.78, 490.04 and 121.24

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Solution

The fourth proportional to 326.78, 490.04 and 121.24 is: 181.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.78 : 490.04 = 121.24 : x
  2. Step 2: Convert to fraction form
    326.78/490.04 = 121.24/x
  3. Step 3: Cross multiply
    326.78x = 490.04 × 121.24
  4. Step 4: Simplify right side
    326.78x = 59,412.45
  5. Step 5: Solve for x
    x = 59,412.45/326.78
  6. Step 6: Final answer
    x = 181.81

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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.