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Finding the Fourth Proportional to 199.38, 275.20 and 121.88

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Solution

The fourth proportional to 199.38, 275.20 and 121.88 is: 168.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.38 : 275.20 = 121.88 : x
  2. Step 2: Convert to fraction form
    199.38/275.20 = 121.88/x
  3. Step 3: Cross multiply
    199.38x = 275.20 × 121.88
  4. Step 4: Simplify right side
    199.38x = 33,541.38
  5. Step 5: Solve for x
    x = 33,541.38/199.38
  6. Step 6: Final answer
    x = 168.23

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.