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Finding the Fourth Proportional to 826.14, 1,238.90 and 338.92

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Solution

The fourth proportional to 826.14, 1,238.90 and 338.92 is: 508.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.14 : 1,238.90 = 338.92 : x
  2. Step 2: Convert to fraction form
    826.14/1,238.90 = 338.92/x
  3. Step 3: Cross multiply
    826.14x = 1,238.90 × 338.92
  4. Step 4: Simplify right side
    826.14x = 419,887.99
  5. Step 5: Solve for x
    x = 419,887.99/826.14
  6. Step 6: Final answer
    x = 508.25

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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.