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Finding the Fourth Proportional to 183.84, 253.80 and 121.80

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Solution

The fourth proportional to 183.84, 253.80 and 121.80 is: 168.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    183.84 : 253.80 = 121.80 : x
  2. Step 2: Convert to fraction form
    183.84/253.80 = 121.80/x
  3. Step 3: Cross multiply
    183.84x = 253.80 × 121.80
  4. Step 4: Simplify right side
    183.84x = 30,912.84
  5. Step 5: Solve for x
    x = 30,912.84/183.84
  6. Step 6: Final answer
    x = 168.15

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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.