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Finding the Fourth Proportional to 238.51, 355.53 and 221.19

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Solution

The fourth proportional to 238.51, 355.53 and 221.19 is: 329.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.51 : 355.53 = 221.19 : x
  2. Step 2: Convert to fraction form
    238.51/355.53 = 221.19/x
  3. Step 3: Cross multiply
    238.51x = 355.53 × 221.19
  4. Step 4: Simplify right side
    238.51x = 78,639.68
  5. Step 5: Solve for x
    x = 78,639.68/238.51
  6. Step 6: Final answer
    x = 329.71

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.