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Finding the Fourth Proportional to 827.58, 1,239.49 and 395.04

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Solution

The fourth proportional to 827.58, 1,239.49 and 395.04 is: 591.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.58 : 1,239.49 = 395.04 : x
  2. Step 2: Convert to fraction form
    827.58/1,239.49 = 395.04/x
  3. Step 3: Cross multiply
    827.58x = 1,239.49 × 395.04
  4. Step 4: Simplify right side
    827.58x = 489,651.05
  5. Step 5: Solve for x
    x = 489,651.05/827.58
  6. Step 6: Final answer
    x = 591.66

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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.