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Finding the Fourth Proportional to 121.97, 167.33 and 118.60

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Solution

The fourth proportional to 121.97, 167.33 and 118.60 is: 162.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.97 : 167.33 = 118.60 : x
  2. Step 2: Convert to fraction form
    121.97/167.33 = 118.60/x
  3. Step 3: Cross multiply
    121.97x = 167.33 × 118.60
  4. Step 4: Simplify right side
    121.97x = 19,845.22
  5. Step 5: Solve for x
    x = 19,845.22/121.97
  6. Step 6: Final answer
    x = 162.70

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.