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Finding the Fourth Proportional to 199.23, 274.86 and 121.60

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Solution

The fourth proportional to 199.23, 274.86 and 121.60 is: 167.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.23 : 274.86 = 121.60 : x
  2. Step 2: Convert to fraction form
    199.23/274.86 = 121.60/x
  3. Step 3: Cross multiply
    199.23x = 274.86 × 121.60
  4. Step 4: Simplify right side
    199.23x = 33,422.98
  5. Step 5: Solve for x
    x = 33,422.98/199.23
  6. Step 6: Final answer
    x = 167.76

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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.