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Finding the Fourth Proportional to 190.36, 262.74 and 128.26

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Solution

The fourth proportional to 190.36, 262.74 and 128.26 is: 177.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.36 : 262.74 = 128.26 : x
  2. Step 2: Convert to fraction form
    190.36/262.74 = 128.26/x
  3. Step 3: Cross multiply
    190.36x = 262.74 × 128.26
  4. Step 4: Simplify right side
    190.36x = 33,699.03
  5. Step 5: Solve for x
    x = 33,699.03/190.36
  6. Step 6: Final answer
    x = 177.03

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.