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Finding the Fourth Proportional to 190.51, 262.94 and 128.34

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Solution

The fourth proportional to 190.51, 262.94 and 128.34 is: 177.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.51 : 262.94 = 128.34 : x
  2. Step 2: Convert to fraction form
    190.51/262.94 = 128.34/x
  3. Step 3: Cross multiply
    190.51x = 262.94 × 128.34
  4. Step 4: Simplify right side
    190.51x = 33,745.72
  5. Step 5: Solve for x
    x = 33,745.72/190.51
  6. Step 6: Final answer
    x = 177.13

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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.