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Finding the Fourth Proportional to 236.56, 353.86 and 215.20

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Solution

The fourth proportional to 236.56, 353.86 and 215.20 is: 321.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    236.56 : 353.86 = 215.20 : x
  2. Step 2: Convert to fraction form
    236.56/353.86 = 215.20/x
  3. Step 3: Cross multiply
    236.56x = 353.86 × 215.20
  4. Step 4: Simplify right side
    236.56x = 76,150.67
  5. Step 5: Solve for x
    x = 76,150.67/236.56
  6. Step 6: Final answer
    x = 321.91

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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.