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Finding the Fourth Proportional to 192.80, 288.72 and 120.56

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Solution

The fourth proportional to 192.80, 288.72 and 120.56 is: 180.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    192.80 : 288.72 = 120.56 : x
  2. Step 2: Convert to fraction form
    192.80/288.72 = 120.56/x
  3. Step 3: Cross multiply
    192.80x = 288.72 × 120.56
  4. Step 4: Simplify right side
    192.80x = 34,808.08
  5. Step 5: Solve for x
    x = 34,808.08/192.80
  6. Step 6: Final answer
    x = 180.54

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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.