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Finding the Fourth Proportional to 236.98, 355.33 and 115.21

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Solution

The fourth proportional to 236.98, 355.33 and 115.21 is: 172.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    236.98 : 355.33 = 115.21 : x
  2. Step 2: Convert to fraction form
    236.98/355.33 = 115.21/x
  3. Step 3: Cross multiply
    236.98x = 355.33 × 115.21
  4. Step 4: Simplify right side
    236.98x = 40,937.57
  5. Step 5: Solve for x
    x = 40,937.57/236.98
  6. Step 6: Final answer
    x = 172.75

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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.