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Finding the Fourth Proportional to 262.72, 394.13 and 80.11

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Solution

The fourth proportional to 262.72, 394.13 and 80.11 is: 120.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    262.72 : 394.13 = 80.11 : x
  2. Step 2: Convert to fraction form
    262.72/394.13 = 80.11/x
  3. Step 3: Cross multiply
    262.72x = 394.13 × 80.11
  4. Step 4: Simplify right side
    262.72x = 31,573.75
  5. Step 5: Solve for x
    x = 31,573.75/262.72
  6. Step 6: Final answer
    x = 120.18

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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.