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Finding the Fourth Proportional to 236.78, 355.16 and 121.19

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Solution

The fourth proportional to 236.78, 355.16 and 121.19 is: 181.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    236.78 : 355.16 = 121.19 : x
  2. Step 2: Convert to fraction form
    236.78/355.16 = 121.19/x
  3. Step 3: Cross multiply
    236.78x = 355.16 × 121.19
  4. Step 4: Simplify right side
    236.78x = 43,039.46
  5. Step 5: Solve for x
    x = 43,039.46/236.78
  6. Step 6: Final answer
    x = 181.77

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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.