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Finding the Fourth Proportional to 190.68, 263.21 and 128.49

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Solution

The fourth proportional to 190.68, 263.21 and 128.49 is: 177.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.68 : 263.21 = 128.49 : x
  2. Step 2: Convert to fraction form
    190.68/263.21 = 128.49/x
  3. Step 3: Cross multiply
    190.68x = 263.21 × 128.49
  4. Step 4: Simplify right side
    190.68x = 33,818.72
  5. Step 5: Solve for x
    x = 33,818.72/190.68
  6. Step 6: Final answer
    x = 177.36

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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.