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Finding the Fourth Proportional to 121.74, 168.69 and 120

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Solution

The fourth proportional to 121.74, 168.69 and 120 is: 166.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.74 : 168.69 = 120 : x
  2. Step 2: Convert to fraction form
    121.74/168.69 = 120/x
  3. Step 3: Cross multiply
    121.74x = 168.69 × 120
  4. Step 4: Simplify right side
    121.74x = 20,242.80
  5. Step 5: Solve for x
    x = 20,242.80/121.74
  6. Step 6: Final answer
    x = 166.28

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.