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Finding the Fourth Proportional to 192.12, 288.21 and 76.54

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Solution

The fourth proportional to 192.12, 288.21 and 76.54 is: 114.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    192.12 : 288.21 = 76.54 : x
  2. Step 2: Convert to fraction form
    192.12/288.21 = 76.54/x
  3. Step 3: Cross multiply
    192.12x = 288.21 × 76.54
  4. Step 4: Simplify right side
    192.12x = 22,058.15
  5. Step 5: Solve for x
    x = 22,058.15/192.12
  6. Step 6: Final answer
    x = 114.82

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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.