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Finding the Fourth Proportional to 192.21, 288.11 and 123.78

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Solution

The fourth proportional to 192.21, 288.11 and 123.78 is: 185.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    192.21 : 288.11 = 123.78 : x
  2. Step 2: Convert to fraction form
    192.21/288.11 = 123.78/x
  3. Step 3: Cross multiply
    192.21x = 288.11 × 123.78
  4. Step 4: Simplify right side
    192.21x = 35,662.26
  5. Step 5: Solve for x
    x = 35,662.26/192.21
  6. Step 6: Final answer
    x = 185.54

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.