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Finding the Fourth Proportional to 218.40, 327.96 and 211.44

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Solution

The fourth proportional to 218.40, 327.96 and 211.44 is: 317.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.40 : 327.96 = 211.44 : x
  2. Step 2: Convert to fraction form
    218.40/327.96 = 211.44/x
  3. Step 3: Cross multiply
    218.40x = 327.96 × 211.44
  4. Step 4: Simplify right side
    218.40x = 69,343.86
  5. Step 5: Solve for x
    x = 69,343.86/218.40
  6. Step 6: Final answer
    x = 317.51

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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.