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Finding the Fourth Proportional to 219.12, 326.54 and 211.38

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Solution

The fourth proportional to 219.12, 326.54 and 211.38 is: 315.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.12 : 326.54 = 211.38 : x
  2. Step 2: Convert to fraction form
    219.12/326.54 = 211.38/x
  3. Step 3: Cross multiply
    219.12x = 326.54 × 211.38
  4. Step 4: Simplify right side
    219.12x = 69,022.97
  5. Step 5: Solve for x
    x = 69,022.97/219.12
  6. Step 6: Final answer
    x = 315.00

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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.