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Finding the Fourth Proportional to 331.22, 456.77 and 248.20

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Solution

The fourth proportional to 331.22, 456.77 and 248.20 is: 342.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.22 : 456.77 = 248.20 : x
  2. Step 2: Convert to fraction form
    331.22/456.77 = 248.20/x
  3. Step 3: Cross multiply
    331.22x = 456.77 × 248.20
  4. Step 4: Simplify right side
    331.22x = 113,369.79
  5. Step 5: Solve for x
    x = 113,369.79/331.22
  6. Step 6: Final answer
    x = 342.28

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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.