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Finding the Fourth Proportional to 331.78, 458.24 and 221.07

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Solution

The fourth proportional to 331.78, 458.24 and 221.07 is: 305.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.78 : 458.24 = 221.07 : x
  2. Step 2: Convert to fraction form
    331.78/458.24 = 221.07/x
  3. Step 3: Cross multiply
    331.78x = 458.24 × 221.07
  4. Step 4: Simplify right side
    331.78x = 101,303.12
  5. Step 5: Solve for x
    x = 101,303.12/331.78
  6. Step 6: Final answer
    x = 305.33

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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.