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Finding the Fourth Proportional to 192.78, 288.90 and 120.42

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Solution

The fourth proportional to 192.78, 288.90 and 120.42 is: 180.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    192.78 : 288.90 = 120.42 : x
  2. Step 2: Convert to fraction form
    192.78/288.90 = 120.42/x
  3. Step 3: Cross multiply
    192.78x = 288.90 × 120.42
  4. Step 4: Simplify right side
    192.78x = 34,789.34
  5. Step 5: Solve for x
    x = 34,789.34/192.78
  6. Step 6: Final answer
    x = 180.46

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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.