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Finding the Fourth Proportional to 326.75, 490.20 and 155.75

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Solution

The fourth proportional to 326.75, 490.20 and 155.75 is: 233.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.75 : 490.20 = 155.75 : x
  2. Step 2: Convert to fraction form
    326.75/490.20 = 155.75/x
  3. Step 3: Cross multiply
    326.75x = 490.20 × 155.75
  4. Step 4: Simplify right side
    326.75x = 76,348.65
  5. Step 5: Solve for x
    x = 76,348.65/326.75
  6. Step 6: Final answer
    x = 233.66

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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.