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Finding the Fourth Proportional to 272.58, 408.35 and 217.85

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Solution

The fourth proportional to 272.58, 408.35 and 217.85 is: 326.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.58 : 408.35 = 217.85 : x
  2. Step 2: Convert to fraction form
    272.58/408.35 = 217.85/x
  3. Step 3: Cross multiply
    272.58x = 408.35 × 217.85
  4. Step 4: Simplify right side
    272.58x = 88,955.92
  5. Step 5: Solve for x
    x = 88,955.92/272.58
  6. Step 6: Final answer
    x = 326.35

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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.