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Finding the Fourth Proportional to 826.14, 1,239.21 and 339.19

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Solution

The fourth proportional to 826.14, 1,239.21 and 339.19 is: 508.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.14 : 1,239.21 = 339.19 : x
  2. Step 2: Convert to fraction form
    826.14/1,239.21 = 339.19/x
  3. Step 3: Cross multiply
    826.14x = 1,239.21 × 339.19
  4. Step 4: Simplify right side
    826.14x = 420,327.64
  5. Step 5: Solve for x
    x = 420,327.64/826.14
  6. Step 6: Final answer
    x = 508.79

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Double scale
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Similar ratio
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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.