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Finding the Fourth Proportional to 141.11, 194.72 and 78.94

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Solution

The fourth proportional to 141.11, 194.72 and 78.94 is: 108.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.11 : 194.72 = 78.94 : x
  2. Step 2: Convert to fraction form
    141.11/194.72 = 78.94/x
  3. Step 3: Cross multiply
    141.11x = 194.72 × 78.94
  4. Step 4: Simplify right side
    141.11x = 15,370.22
  5. Step 5: Solve for x
    x = 15,370.22/141.11
  6. Step 6: Final answer
    x = 108.93

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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.