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Finding the Fourth Proportional to 823.86, 1,235.82 and 336.78

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Solution

The fourth proportional to 823.86, 1,235.82 and 336.78 is: 505.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.86 : 1,235.82 = 336.78 : x
  2. Step 2: Convert to fraction form
    823.86/1,235.82 = 336.78/x
  3. Step 3: Cross multiply
    823.86x = 1,235.82 × 336.78
  4. Step 4: Simplify right side
    823.86x = 416,199.46
  5. Step 5: Solve for x
    x = 416,199.46/823.86
  6. Step 6: Final answer
    x = 505.18

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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.