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Finding the Fourth Proportional to 121.23, 180.41 and 116.91

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Solution

The fourth proportional to 121.23, 180.41 and 116.91 is: 173.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.23 : 180.41 = 116.91 : x
  2. Step 2: Convert to fraction form
    121.23/180.41 = 116.91/x
  3. Step 3: Cross multiply
    121.23x = 180.41 × 116.91
  4. Step 4: Simplify right side
    121.23x = 21,091.15
  5. Step 5: Solve for x
    x = 21,091.15/121.23
  6. Step 6: Final answer
    x = 173.98

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.