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Finding the Fourth Proportional to 218.64, 326.40 and 211.92

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Solution

The fourth proportional to 218.64, 326.40 and 211.92 is: 316.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.64 : 326.40 = 211.92 : x
  2. Step 2: Convert to fraction form
    218.64/326.40 = 211.92/x
  3. Step 3: Cross multiply
    218.64x = 326.40 × 211.92
  4. Step 4: Simplify right side
    218.64x = 69,170.69
  5. Step 5: Solve for x
    x = 69,170.69/218.64
  6. Step 6: Final answer
    x = 316.37

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.