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Finding the Fourth Proportional to 199.50, 275.31 and 121.92

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Solution

The fourth proportional to 199.50, 275.31 and 121.92 is: 168.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.50 : 275.31 = 121.92 : x
  2. Step 2: Convert to fraction form
    199.50/275.31 = 121.92/x
  3. Step 3: Cross multiply
    199.50x = 275.31 × 121.92
  4. Step 4: Simplify right side
    199.50x = 33,565.80
  5. Step 5: Solve for x
    x = 33,565.80/199.50
  6. Step 6: Final answer
    x = 168.25

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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.