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Finding the Fourth Proportional to 262.74, 394.11 and 80.15

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Solution

The fourth proportional to 262.74, 394.11 and 80.15 is: 120.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    262.74 : 394.11 = 80.15 : x
  2. Step 2: Convert to fraction form
    262.74/394.11 = 80.15/x
  3. Step 3: Cross multiply
    262.74x = 394.11 × 80.15
  4. Step 4: Simplify right side
    262.74x = 31,588.90
  5. Step 5: Solve for x
    x = 31,588.90/262.74
  6. Step 6: Final answer
    x = 120.23

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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.