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Finding the Fourth Proportional to 183.98, 253.95 and 121.79

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Solution

The fourth proportional to 183.98, 253.95 and 121.79 is: 168.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    183.98 : 253.95 = 121.79 : x
  2. Step 2: Convert to fraction form
    183.98/253.95 = 121.79/x
  3. Step 3: Cross multiply
    183.98x = 253.95 × 121.79
  4. Step 4: Simplify right side
    183.98x = 30,928.01
  5. Step 5: Solve for x
    x = 30,928.01/183.98
  6. Step 6: Final answer
    x = 168.11

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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.