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Finding the Fourth Proportional to 199.32, 275.07 and 121.68

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Solution

The fourth proportional to 199.32, 275.07 and 121.68 is: 167.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.32 : 275.07 = 121.68 : x
  2. Step 2: Convert to fraction form
    199.32/275.07 = 121.68/x
  3. Step 3: Cross multiply
    199.32x = 275.07 × 121.68
  4. Step 4: Simplify right side
    199.32x = 33,470.52
  5. Step 5: Solve for x
    x = 33,470.52/199.32
  6. Step 6: Final answer
    x = 167.92

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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.