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Finding the Fourth Proportional to 131.96, 197.19 and 128.92

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Solution

The fourth proportional to 131.96, 197.19 and 128.92 is: 192.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.96 : 197.19 = 128.92 : x
  2. Step 2: Convert to fraction form
    131.96/197.19 = 128.92/x
  3. Step 3: Cross multiply
    131.96x = 197.19 × 128.92
  4. Step 4: Simplify right side
    131.96x = 25,421.73
  5. Step 5: Solve for x
    x = 25,421.73/131.96
  6. Step 6: Final answer
    x = 192.65

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.