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Finding the Fourth Proportional to 826.29, 1,239.40 and 339.33

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Solution

The fourth proportional to 826.29, 1,239.40 and 339.33 is: 508.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.29 : 1,239.40 = 339.33 : x
  2. Step 2: Convert to fraction form
    826.29/1,239.40 = 339.33/x
  3. Step 3: Cross multiply
    826.29x = 1,239.40 × 339.33
  4. Step 4: Simplify right side
    826.29x = 420,563.70
  5. Step 5: Solve for x
    x = 420,563.70/826.29
  6. Step 6: Final answer
    x = 508.98

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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.