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Finding the Fourth Proportional to 331.52, 457.40 and 221.06

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Solution

The fourth proportional to 331.52, 457.40 and 221.06 is: 305.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.52 : 457.40 = 221.06 : x
  2. Step 2: Convert to fraction form
    331.52/457.40 = 221.06/x
  3. Step 3: Cross multiply
    331.52x = 457.40 × 221.06
  4. Step 4: Simplify right side
    331.52x = 101,114.54
  5. Step 5: Solve for x
    x = 101,114.54/331.52
  6. Step 6: Final answer
    x = 305.01

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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.