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Finding the Fourth Proportional to 192.21, 288.41 and 115.22

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Solution

The fourth proportional to 192.21, 288.41 and 115.22 is: 172.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    192.21 : 288.41 = 115.22 : x
  2. Step 2: Convert to fraction form
    192.21/288.41 = 115.22/x
  3. Step 3: Cross multiply
    192.21x = 288.41 × 115.22
  4. Step 4: Simplify right side
    192.21x = 33,228.58
  5. Step 5: Solve for x
    x = 33,228.58/192.21
  6. Step 6: Final answer
    x = 172.88

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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.