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Finding the Fourth Proportional to 192.16, 288.32 and 131.28

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Solution

The fourth proportional to 192.16, 288.32 and 131.28 is: 196.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    192.16 : 288.32 = 131.28 : x
  2. Step 2: Convert to fraction form
    192.16/288.32 = 131.28/x
  3. Step 3: Cross multiply
    192.16x = 288.32 × 131.28
  4. Step 4: Simplify right side
    192.16x = 37,850.65
  5. Step 5: Solve for x
    x = 37,850.65/192.16
  6. Step 6: Final answer
    x = 196.97

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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.