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Finding the Fourth Proportional to 331.24, 456.78 and 213.20

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Solution

The fourth proportional to 331.24, 456.78 and 213.20 is: 293.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.24 : 456.78 = 213.20 : x
  2. Step 2: Convert to fraction form
    331.24/456.78 = 213.20/x
  3. Step 3: Cross multiply
    331.24x = 456.78 × 213.20
  4. Step 4: Simplify right side
    331.24x = 97,382.15
  5. Step 5: Solve for x
    x = 97,382.15/331.24
  6. Step 6: Final answer
    x = 293.99

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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.