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Finding the Fourth Proportional to 263.03, 394.60 and 80.42

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Solution

The fourth proportional to 263.03, 394.60 and 80.42 is: 120.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    263.03 : 394.60 = 80.42 : x
  2. Step 2: Convert to fraction form
    263.03/394.60 = 80.42/x
  3. Step 3: Cross multiply
    263.03x = 394.60 × 80.42
  4. Step 4: Simplify right side
    263.03x = 31,731.51
  5. Step 5: Solve for x
    x = 31,731.51/263.03
  6. Step 6: Final answer
    x = 120.64

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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.