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Finding the Fourth Proportional to 235.51, 353.41 and 217.85

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Solution

The fourth proportional to 235.51, 353.41 and 217.85 is: 326.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    235.51 : 353.41 = 217.85 : x
  2. Step 2: Convert to fraction form
    235.51/353.41 = 217.85/x
  3. Step 3: Cross multiply
    235.51x = 353.41 × 217.85
  4. Step 4: Simplify right side
    235.51x = 76,988.06
  5. Step 5: Solve for x
    x = 76,988.06/235.51
  6. Step 6: Final answer
    x = 326.90

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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.