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Finding the Fourth Proportional to 338.25, 507.41 and 121.85

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Solution

The fourth proportional to 338.25, 507.41 and 121.85 is: 182.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    338.25 : 507.41 = 121.85 : x
  2. Step 2: Convert to fraction form
    338.25/507.41 = 121.85/x
  3. Step 3: Cross multiply
    338.25x = 507.41 × 121.85
  4. Step 4: Simplify right side
    338.25x = 61,827.91
  5. Step 5: Solve for x
    x = 61,827.91/338.25
  6. Step 6: Final answer
    x = 182.79

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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.