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Finding the Fourth Proportional to 826.22, 1,238.49 and 518.28

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Solution

The fourth proportional to 826.22, 1,238.49 and 518.28 is: 776.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.22 : 1,238.49 = 518.28 : x
  2. Step 2: Convert to fraction form
    826.22/1,238.49 = 518.28/x
  3. Step 3: Cross multiply
    826.22x = 1,238.49 × 518.28
  4. Step 4: Simplify right side
    826.22x = 641,884.60
  5. Step 5: Solve for x
    x = 641,884.60/826.22
  6. Step 6: Final answer
    x = 776.89

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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.