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Finding the Fourth Proportional to 331.15, 456.81 and 211.29

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Solution

The fourth proportional to 331.15, 456.81 and 211.29 is: 291.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.15 : 456.81 = 211.29 : x
  2. Step 2: Convert to fraction form
    331.15/456.81 = 211.29/x
  3. Step 3: Cross multiply
    331.15x = 456.81 × 211.29
  4. Step 4: Simplify right side
    331.15x = 96,519.38
  5. Step 5: Solve for x
    x = 96,519.38/331.15
  6. Step 6: Final answer
    x = 291.47

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.