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Finding the Fourth Proportional to 326.86, 490.48 and 121.57

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Solution

The fourth proportional to 326.86, 490.48 and 121.57 is: 182.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.86 : 490.48 = 121.57 : x
  2. Step 2: Convert to fraction form
    326.86/490.48 = 121.57/x
  3. Step 3: Cross multiply
    326.86x = 490.48 × 121.57
  4. Step 4: Simplify right side
    326.86x = 59,627.65
  5. Step 5: Solve for x
    x = 59,627.65/326.86
  6. Step 6: Final answer
    x = 182.43

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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.