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Finding the Fourth Proportional to 300.78, 451.20 and 105.78

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Solution

The fourth proportional to 300.78, 451.20 and 105.78 is: 158.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    300.78 : 451.20 = 105.78 : x
  2. Step 2: Convert to fraction form
    300.78/451.20 = 105.78/x
  3. Step 3: Cross multiply
    300.78x = 451.20 × 105.78
  4. Step 4: Simplify right side
    300.78x = 47,727.94
  5. Step 5: Solve for x
    x = 47,727.94/300.78
  6. Step 6: Final answer
    x = 158.68

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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.