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Finding the Fourth Proportional to 190.95, 263.08 and 128.67

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Solution

The fourth proportional to 190.95, 263.08 and 128.67 is: 177.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.95 : 263.08 = 128.67 : x
  2. Step 2: Convert to fraction form
    190.95/263.08 = 128.67/x
  3. Step 3: Cross multiply
    190.95x = 263.08 × 128.67
  4. Step 4: Simplify right side
    190.95x = 33,848.87
  5. Step 5: Solve for x
    x = 33,848.87/190.95
  6. Step 6: Final answer
    x = 177.27

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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.