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Finding the Fourth Proportional to 823.78, 1,235.19 and 336.26

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Solution

The fourth proportional to 823.78, 1,235.19 and 336.26 is: 504.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.78 : 1,235.19 = 336.26 : x
  2. Step 2: Convert to fraction form
    823.78/1,235.19 = 336.26/x
  3. Step 3: Cross multiply
    823.78x = 1,235.19 × 336.26
  4. Step 4: Simplify right side
    823.78x = 415,344.99
  5. Step 5: Solve for x
    x = 415,344.99/823.78
  6. Step 6: Final answer
    x = 504.19

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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.