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Finding the Fourth Proportional to 199.35, 275.12 and 121.73

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Solution

The fourth proportional to 199.35, 275.12 and 121.73 is: 167.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.35 : 275.12 = 121.73 : x
  2. Step 2: Convert to fraction form
    199.35/275.12 = 121.73/x
  3. Step 3: Cross multiply
    199.35x = 275.12 × 121.73
  4. Step 4: Simplify right side
    199.35x = 33,488.37
  5. Step 5: Solve for x
    x = 33,488.37/199.35
  6. Step 6: Final answer
    x = 167.99

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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.