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Finding the Fourth Proportional to 263.20, 394.69 and 80.53

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Solution

The fourth proportional to 263.20, 394.69 and 80.53 is: 120.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    263.20 : 394.69 = 80.53 : x
  2. Step 2: Convert to fraction form
    263.20/394.69 = 80.53/x
  3. Step 3: Cross multiply
    263.20x = 394.69 × 80.53
  4. Step 4: Simplify right side
    263.20x = 31,784.39
  5. Step 5: Solve for x
    x = 31,784.39/263.20
  6. Step 6: Final answer
    x = 120.76

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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.