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Finding the Fourth Proportional to 823.86, 1,235.84 and 336.87

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Solution

The fourth proportional to 823.86, 1,235.84 and 336.87 is: 505.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.86 : 1,235.84 = 336.87 : x
  2. Step 2: Convert to fraction form
    823.86/1,235.84 = 336.87/x
  3. Step 3: Cross multiply
    823.86x = 1,235.84 × 336.87
  4. Step 4: Simplify right side
    823.86x = 416,315.74
  5. Step 5: Solve for x
    x = 416,315.74/823.86
  6. Step 6: Final answer
    x = 505.32

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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.