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Finding the Fourth Proportional to 218.20, 327.50 and 208.98

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Solution

The fourth proportional to 218.20, 327.50 and 208.98 is: 313.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.20 : 327.50 = 208.98 : x
  2. Step 2: Convert to fraction form
    218.20/327.50 = 208.98/x
  3. Step 3: Cross multiply
    218.20x = 327.50 × 208.98
  4. Step 4: Simplify right side
    218.20x = 68,440.95
  5. Step 5: Solve for x
    x = 68,440.95/218.20
  6. Step 6: Final answer
    x = 313.66

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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.