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Finding the Fourth Proportional to 331.44, 497.91 and 209.82

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Solution

The fourth proportional to 331.44, 497.91 and 209.82 is: 315.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.44 : 497.91 = 209.82 : x
  2. Step 2: Convert to fraction form
    331.44/497.91 = 209.82/x
  3. Step 3: Cross multiply
    331.44x = 497.91 × 209.82
  4. Step 4: Simplify right side
    331.44x = 104,471.48
  5. Step 5: Solve for x
    x = 104,471.48/331.44
  6. Step 6: Final answer
    x = 315.20

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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.