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Finding the Fourth Proportional to 331.53, 457.70 and 221.19

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Solution

The fourth proportional to 331.53, 457.70 and 221.19 is: 305.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.53 : 457.70 = 221.19 : x
  2. Step 2: Convert to fraction form
    331.53/457.70 = 221.19/x
  3. Step 3: Cross multiply
    331.53x = 457.70 × 221.19
  4. Step 4: Simplify right side
    331.53x = 101,238.66
  5. Step 5: Solve for x
    x = 101,238.66/331.53
  6. Step 6: Final answer
    x = 305.37

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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.