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Finding the Fourth Proportional to 355.25, 490.65 and 238.61

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Solution

The fourth proportional to 355.25, 490.65 and 238.61 is: 329.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.25 : 490.65 = 238.61 : x
  2. Step 2: Convert to fraction form
    355.25/490.65 = 238.61/x
  3. Step 3: Cross multiply
    355.25x = 490.65 × 238.61
  4. Step 4: Simplify right side
    355.25x = 117,074.00
  5. Step 5: Solve for x
    x = 117,074.00/355.25
  6. Step 6: Final answer
    x = 329.55

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.