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Finding the Fourth Proportional to 827.90, 1,239.42 and 644.73

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Solution

The fourth proportional to 827.90, 1,239.42 and 644.73 is: 965.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.90 : 1,239.42 = 644.73 : x
  2. Step 2: Convert to fraction form
    827.90/1,239.42 = 644.73/x
  3. Step 3: Cross multiply
    827.90x = 1,239.42 × 644.73
  4. Step 4: Simplify right side
    827.90x = 799,091.26
  5. Step 5: Solve for x
    x = 799,091.26/827.90
  6. Step 6: Final answer
    x = 965.21

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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.