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Finding the Fourth Proportional to 183.99, 253.97 and 121.86

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Solution

The fourth proportional to 183.99, 253.97 and 121.86 is: 168.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    183.99 : 253.97 = 121.86 : x
  2. Step 2: Convert to fraction form
    183.99/253.97 = 121.86/x
  3. Step 3: Cross multiply
    183.99x = 253.97 × 121.86
  4. Step 4: Simplify right side
    183.99x = 30,948.17
  5. Step 5: Solve for x
    x = 30,948.17/183.99
  6. Step 6: Final answer
    x = 168.21

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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.