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Finding the Fourth Proportional to 190.50, 262.79 and 128.22

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Solution

The fourth proportional to 190.50, 262.79 and 128.22 is: 176.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.50 : 262.79 = 128.22 : x
  2. Step 2: Convert to fraction form
    190.50/262.79 = 128.22/x
  3. Step 3: Cross multiply
    190.50x = 262.79 × 128.22
  4. Step 4: Simplify right side
    190.50x = 33,695.76
  5. Step 5: Solve for x
    x = 33,695.76/190.50
  6. Step 6: Final answer
    x = 176.88

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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.