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Finding the Fourth Proportional to 121.49, 180.99 and 115.69

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Solution

The fourth proportional to 121.49, 180.99 and 115.69 is: 172.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.49 : 180.99 = 115.69 : x
  2. Step 2: Convert to fraction form
    121.49/180.99 = 115.69/x
  3. Step 3: Cross multiply
    121.49x = 180.99 × 115.69
  4. Step 4: Simplify right side
    121.49x = 20,938.73
  5. Step 5: Solve for x
    x = 20,938.73/121.49
  6. Step 6: Final answer
    x = 172.35

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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.