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Finding the Fourth Proportional to 194.67, 268.79 and 129.33

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Solution

The fourth proportional to 194.67, 268.79 and 129.33 is: 178.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    194.67 : 268.79 = 129.33 : x
  2. Step 2: Convert to fraction form
    194.67/268.79 = 129.33/x
  3. Step 3: Cross multiply
    194.67x = 268.79 × 129.33
  4. Step 4: Simplify right side
    194.67x = 34,761.96
  5. Step 5: Solve for x
    x = 34,761.96/194.67
  6. Step 6: Final answer
    x = 178.57

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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.