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Finding the Fourth Proportional to 194.97, 269.19 and 121.40

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Solution

The fourth proportional to 194.97, 269.19 and 121.40 is: 167.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    194.97 : 269.19 = 121.40 : x
  2. Step 2: Convert to fraction form
    194.97/269.19 = 121.40/x
  3. Step 3: Cross multiply
    194.97x = 269.19 × 121.40
  4. Step 4: Simplify right side
    194.97x = 32,677.71
  5. Step 5: Solve for x
    x = 32,677.71/194.97
  6. Step 6: Final answer
    x = 167.60

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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.