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Finding the Fourth Proportional to 826.68, 1,239.29 and 339.42

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Solution

The fourth proportional to 826.68, 1,239.29 and 339.42 is: 508.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.68 : 1,239.29 = 339.42 : x
  2. Step 2: Convert to fraction form
    826.68/1,239.29 = 339.42/x
  3. Step 3: Cross multiply
    826.68x = 1,239.29 × 339.42
  4. Step 4: Simplify right side
    826.68x = 420,639.81
  5. Step 5: Solve for x
    x = 420,639.81/826.68
  6. Step 6: Final answer
    x = 508.83

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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.