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Finding the Fourth Proportional to 338.31, 506.97 and 257.22

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Solution

The fourth proportional to 338.31, 506.97 and 257.22 is: 385.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    338.31 : 506.97 = 257.22 : x
  2. Step 2: Convert to fraction form
    338.31/506.97 = 257.22/x
  3. Step 3: Cross multiply
    338.31x = 506.97 × 257.22
  4. Step 4: Simplify right side
    338.31x = 130,402.82
  5. Step 5: Solve for x
    x = 130,402.82/338.31
  6. Step 6: Final answer
    x = 385.45

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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.