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Finding the Fourth Proportional to 338.05, 506.17 and 215.65

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Solution

The fourth proportional to 338.05, 506.17 and 215.65 is: 322.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    338.05 : 506.17 = 215.65 : x
  2. Step 2: Convert to fraction form
    338.05/506.17 = 215.65/x
  3. Step 3: Cross multiply
    338.05x = 506.17 × 215.65
  4. Step 4: Simplify right side
    338.05x = 109,155.56
  5. Step 5: Solve for x
    x = 109,155.56/338.05
  6. Step 6: Final answer
    x = 322.90

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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.