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Finding the Fourth Proportional to 338.39, 508.39 and 216.89

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Solution

The fourth proportional to 338.39, 508.39 and 216.89 is: 325.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    338.39 : 508.39 = 216.89 : x
  2. Step 2: Convert to fraction form
    338.39/508.39 = 216.89/x
  3. Step 3: Cross multiply
    338.39x = 508.39 × 216.89
  4. Step 4: Simplify right side
    338.39x = 110,261.62
  5. Step 5: Solve for x
    x = 110,261.62/338.39
  6. Step 6: Final answer
    x = 325.85

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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.