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Finding the Fourth Proportional to 825.59, 1,238.84 and 338.98

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Solution

The fourth proportional to 825.59, 1,238.84 and 338.98 is: 508.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.59 : 1,238.84 = 338.98 : x
  2. Step 2: Convert to fraction form
    825.59/1,238.84 = 338.98/x
  3. Step 3: Cross multiply
    825.59x = 1,238.84 × 338.98
  4. Step 4: Simplify right side
    825.59x = 419,935.79
  5. Step 5: Solve for x
    x = 419,935.79/825.59
  6. Step 6: Final answer
    x = 508.65

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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.