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Finding the Fourth Proportional to 823.86, 1,235.07 and 311.22

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Solution

The fourth proportional to 823.86, 1,235.07 and 311.22 is: 466.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.86 : 1,235.07 = 311.22 : x
  2. Step 2: Convert to fraction form
    823.86/1,235.07 = 311.22/x
  3. Step 3: Cross multiply
    823.86x = 1,235.07 × 311.22
  4. Step 4: Simplify right side
    823.86x = 384,378.49
  5. Step 5: Solve for x
    x = 384,378.49/823.86
  6. Step 6: Final answer
    x = 466.56

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.