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Finding the Fourth Proportional to 141.31, 194.88 and 113.68

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Solution

The fourth proportional to 141.31, 194.88 and 113.68 is: 156.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.31 : 194.88 = 113.68 : x
  2. Step 2: Convert to fraction form
    141.31/194.88 = 113.68/x
  3. Step 3: Cross multiply
    141.31x = 194.88 × 113.68
  4. Step 4: Simplify right side
    141.31x = 22,153.96
  5. Step 5: Solve for x
    x = 22,153.96/141.31
  6. Step 6: Final answer
    x = 156.78

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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.