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Finding the Fourth Proportional to 221.38, 331.99 and 99.56

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Solution

The fourth proportional to 221.38, 331.99 and 99.56 is: 149.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.38 : 331.99 = 99.56 : x
  2. Step 2: Convert to fraction form
    221.38/331.99 = 99.56/x
  3. Step 3: Cross multiply
    221.38x = 331.99 × 99.56
  4. Step 4: Simplify right side
    221.38x = 33,053.51
  5. Step 5: Solve for x
    x = 33,053.51/221.38
  6. Step 6: Final answer
    x = 149.31

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.