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Finding the Fourth Proportional to 190.78, 263.21 and 107.89

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Solution

The fourth proportional to 190.78, 263.21 and 107.89 is: 148.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.78 : 263.21 = 107.89 : x
  2. Step 2: Convert to fraction form
    190.78/263.21 = 107.89/x
  3. Step 3: Cross multiply
    190.78x = 263.21 × 107.89
  4. Step 4: Simplify right side
    190.78x = 28,396.53
  5. Step 5: Solve for x
    x = 28,396.53/190.78
  6. Step 6: Final answer
    x = 148.85

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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.