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Finding the Fourth Proportional to 143.71, 198.33 and 78.22

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Solution

The fourth proportional to 143.71, 198.33 and 78.22 is: 107.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.71 : 198.33 = 78.22 : x
  2. Step 2: Convert to fraction form
    143.71/198.33 = 78.22/x
  3. Step 3: Cross multiply
    143.71x = 198.33 × 78.22
  4. Step 4: Simplify right side
    143.71x = 15,511.99
  5. Step 5: Solve for x
    x = 15,511.99/143.71
  6. Step 6: Final answer
    x = 107.94

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.