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Finding the Fourth Proportional to 324.43, 486.90 and 119.21

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Solution

The fourth proportional to 324.43, 486.90 and 119.21 is: 178.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    324.43 : 486.90 = 119.21 : x
  2. Step 2: Convert to fraction form
    324.43/486.90 = 119.21/x
  3. Step 3: Cross multiply
    324.43x = 486.90 × 119.21
  4. Step 4: Simplify right side
    324.43x = 58,040.91
  5. Step 5: Solve for x
    x = 58,040.91/324.43
  6. Step 6: Final answer
    x = 178.90

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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.