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Finding the Fourth Proportional to 192.38, 288.66 and 131.72

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Solution

The fourth proportional to 192.38, 288.66 and 131.72 is: 197.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    192.38 : 288.66 = 131.72 : x
  2. Step 2: Convert to fraction form
    192.38/288.66 = 131.72/x
  3. Step 3: Cross multiply
    192.38x = 288.66 × 131.72
  4. Step 4: Simplify right side
    192.38x = 38,022.30
  5. Step 5: Solve for x
    x = 38,022.30/192.38
  6. Step 6: Final answer
    x = 197.64

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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.