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Finding the Fourth Proportional to 218.63, 326.50 and 206.79

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Solution

The fourth proportional to 218.63, 326.50 and 206.79 is: 308.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.63 : 326.50 = 206.79 : x
  2. Step 2: Convert to fraction form
    218.63/326.50 = 206.79/x
  3. Step 3: Cross multiply
    218.63x = 326.50 × 206.79
  4. Step 4: Simplify right side
    218.63x = 67,516.94
  5. Step 5: Solve for x
    x = 67,516.94/218.63
  6. Step 6: Final answer
    x = 308.82

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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.