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Finding the Fourth Proportional to 199.36, 275.20 and 121.76

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Solution

The fourth proportional to 199.36, 275.20 and 121.76 is: 168.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.36 : 275.20 = 121.76 : x
  2. Step 2: Convert to fraction form
    199.36/275.20 = 121.76/x
  3. Step 3: Cross multiply
    199.36x = 275.20 × 121.76
  4. Step 4: Simplify right side
    199.36x = 33,508.35
  5. Step 5: Solve for x
    x = 33,508.35/199.36
  6. Step 6: Final answer
    x = 168.08

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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.