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Finding the Fourth Proportional to 826.80, 1,239.54 and 339.54

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Solution

The fourth proportional to 826.80, 1,239.54 and 339.54 is: 509.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.80 : 1,239.54 = 339.54 : x
  2. Step 2: Convert to fraction form
    826.80/1,239.54 = 339.54/x
  3. Step 3: Cross multiply
    826.80x = 1,239.54 × 339.54
  4. Step 4: Simplify right side
    826.80x = 420,873.41
  5. Step 5: Solve for x
    x = 420,873.41/826.80
  6. Step 6: Final answer
    x = 509.04

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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.