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Finding the Fourth Proportional to 219.63, 330.91 and 198.81

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Solution

The fourth proportional to 219.63, 330.91 and 198.81 is: 299.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.63 : 330.91 = 198.81 : x
  2. Step 2: Convert to fraction form
    219.63/330.91 = 198.81/x
  3. Step 3: Cross multiply
    219.63x = 330.91 × 198.81
  4. Step 4: Simplify right side
    219.63x = 65,788.22
  5. Step 5: Solve for x
    x = 65,788.22/219.63
  6. Step 6: Final answer
    x = 299.54

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.