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Finding the Fourth Proportional to 254.80, 381.90 and 190.60

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Solution

The fourth proportional to 254.80, 381.90 and 190.60 is: 285.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.80 : 381.90 = 190.60 : x
  2. Step 2: Convert to fraction form
    254.80/381.90 = 190.60/x
  3. Step 3: Cross multiply
    254.80x = 381.90 × 190.60
  4. Step 4: Simplify right side
    254.80x = 72,790.14
  5. Step 5: Solve for x
    x = 72,790.14/254.80
  6. Step 6: Final answer
    x = 285.68

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.