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Finding the Fourth Proportional to 262.95, 394.49 and 80.34

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Solution

The fourth proportional to 262.95, 394.49 and 80.34 is: 120.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    262.95 : 394.49 = 80.34 : x
  2. Step 2: Convert to fraction form
    262.95/394.49 = 80.34/x
  3. Step 3: Cross multiply
    262.95x = 394.49 × 80.34
  4. Step 4: Simplify right side
    262.95x = 31,692.92
  5. Step 5: Solve for x
    x = 31,692.92/262.95
  6. Step 6: Final answer
    x = 120.53

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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.