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Finding the Fourth Proportional to 190.37, 262.58 and 128.21

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Solution

The fourth proportional to 190.37, 262.58 and 128.21 is: 176.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.37 : 262.58 = 128.21 : x
  2. Step 2: Convert to fraction form
    190.37/262.58 = 128.21/x
  3. Step 3: Cross multiply
    190.37x = 262.58 × 128.21
  4. Step 4: Simplify right side
    190.37x = 33,663.43
  5. Step 5: Solve for x
    x = 33,663.43/190.37
  6. Step 6: Final answer
    x = 176.84

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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.