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Finding the Fourth Proportional to 825.92, 1,238.88 and 339.20

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Solution

The fourth proportional to 825.92, 1,238.88 and 339.20 is: 508.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.92 : 1,238.88 = 339.20 : x
  2. Step 2: Convert to fraction form
    825.92/1,238.88 = 339.20/x
  3. Step 3: Cross multiply
    825.92x = 1,238.88 × 339.20
  4. Step 4: Simplify right side
    825.92x = 420,228.10
  5. Step 5: Solve for x
    x = 420,228.10/825.92
  6. Step 6: Final answer
    x = 508.80

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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.