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Finding the Fourth Proportional to 331.72, 497.31 and 209.72

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Solution

The fourth proportional to 331.72, 497.31 and 209.72 is: 314.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.72 : 497.31 = 209.72 : x
  2. Step 2: Convert to fraction form
    331.72/497.31 = 209.72/x
  3. Step 3: Cross multiply
    331.72x = 497.31 × 209.72
  4. Step 4: Simplify right side
    331.72x = 104,295.85
  5. Step 5: Solve for x
    x = 104,295.85/331.72
  6. Step 6: Final answer
    x = 314.41

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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.