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Finding the Fourth Proportional to 338.92, 508.61 and 220.31

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Solution

The fourth proportional to 338.92, 508.61 and 220.31 is: 330.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    338.92 : 508.61 = 220.31 : x
  2. Step 2: Convert to fraction form
    338.92/508.61 = 220.31/x
  3. Step 3: Cross multiply
    338.92x = 508.61 × 220.31
  4. Step 4: Simplify right side
    338.92x = 112,051.87
  5. Step 5: Solve for x
    x = 112,051.87/338.92
  6. Step 6: Final answer
    x = 330.61

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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.