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Finding the Fourth Proportional to 331.66, 457.82 and 221.30

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Solution

The fourth proportional to 331.66, 457.82 and 221.30 is: 305.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.66 : 457.82 = 221.30 : x
  2. Step 2: Convert to fraction form
    331.66/457.82 = 221.30/x
  3. Step 3: Cross multiply
    331.66x = 457.82 × 221.30
  4. Step 4: Simplify right side
    331.66x = 101,315.57
  5. Step 5: Solve for x
    x = 101,315.57/331.66
  6. Step 6: Final answer
    x = 305.48

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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.