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Finding the Fourth Proportional to 827.21, 1,239.44 and 518.29

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Solution

The fourth proportional to 827.21, 1,239.44 and 518.29 is: 776.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.21 : 1,239.44 = 518.29 : x
  2. Step 2: Convert to fraction form
    827.21/1,239.44 = 518.29/x
  3. Step 3: Cross multiply
    827.21x = 1,239.44 × 518.29
  4. Step 4: Simplify right side
    827.21x = 642,395.01
  5. Step 5: Solve for x
    x = 642,395.01/827.21
  6. Step 6: Final answer
    x = 776.58

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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.