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Finding the Fourth Proportional to 826.60, 1,239.89 and 339.31

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Solution

The fourth proportional to 826.60, 1,239.89 and 339.31 is: 508.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.60 : 1,239.89 = 339.31 : x
  2. Step 2: Convert to fraction form
    826.60/1,239.89 = 339.31/x
  3. Step 3: Cross multiply
    826.60x = 1,239.89 × 339.31
  4. Step 4: Simplify right side
    826.60x = 420,704.82
  5. Step 5: Solve for x
    x = 420,704.82/826.60
  6. Step 6: Final answer
    x = 508.96

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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.