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Finding the Fourth Proportional to 131.36, 195.64 and 128.18

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Solution

The fourth proportional to 131.36, 195.64 and 128.18 is: 190.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.36 : 195.64 = 128.18 : x
  2. Step 2: Convert to fraction form
    131.36/195.64 = 128.18/x
  3. Step 3: Cross multiply
    131.36x = 195.64 × 128.18
  4. Step 4: Simplify right side
    131.36x = 25,077.14
  5. Step 5: Solve for x
    x = 25,077.14/131.36
  6. Step 6: Final answer
    x = 190.90

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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.