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Finding the Fourth Proportional to 141.18, 194.66 and 121.47

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Solution

The fourth proportional to 141.18, 194.66 and 121.47 is: 167.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.18 : 194.66 = 121.47 : x
  2. Step 2: Convert to fraction form
    141.18/194.66 = 121.47/x
  3. Step 3: Cross multiply
    141.18x = 194.66 × 121.47
  4. Step 4: Simplify right side
    141.18x = 23,644.74
  5. Step 5: Solve for x
    x = 23,644.74/141.18
  6. Step 6: Final answer
    x = 167.48

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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.