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Finding the Fourth Proportional to 193.89, 290.44 and 121.40

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Solution

The fourth proportional to 193.89, 290.44 and 121.40 is: 181.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    193.89 : 290.44 = 121.40 : x
  2. Step 2: Convert to fraction form
    193.89/290.44 = 121.40/x
  3. Step 3: Cross multiply
    193.89x = 290.44 × 121.40
  4. Step 4: Simplify right side
    193.89x = 35,258.52
  5. Step 5: Solve for x
    x = 35,258.52/193.89
  6. Step 6: Final answer
    x = 181.84

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.