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Finding the Fourth Proportional to 825.57, 1,238.40 and 338.64

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Solution

The fourth proportional to 825.57, 1,238.40 and 338.64 is: 507.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.57 : 1,238.40 = 338.64 : x
  2. Step 2: Convert to fraction form
    825.57/1,238.40 = 338.64/x
  3. Step 3: Cross multiply
    825.57x = 1,238.40 × 338.64
  4. Step 4: Simplify right side
    825.57x = 419,371.78
  5. Step 5: Solve for x
    x = 419,371.78/825.57
  6. Step 6: Final answer
    x = 507.98

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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.