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Finding the Fourth Proportional to 190.28, 262.60 and 128.10

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Solution

The fourth proportional to 190.28, 262.60 and 128.10 is: 176.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.28 : 262.60 = 128.10 : x
  2. Step 2: Convert to fraction form
    190.28/262.60 = 128.10/x
  3. Step 3: Cross multiply
    190.28x = 262.60 × 128.10
  4. Step 4: Simplify right side
    190.28x = 33,639.06
  5. Step 5: Solve for x
    x = 33,639.06/190.28
  6. Step 6: Final answer
    x = 176.79

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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.