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Finding the Fourth Proportional to 221.25, 331.81 and 84.35

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Solution

The fourth proportional to 221.25, 331.81 and 84.35 is: 126.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.25 : 331.81 = 84.35 : x
  2. Step 2: Convert to fraction form
    221.25/331.81 = 84.35/x
  3. Step 3: Cross multiply
    221.25x = 331.81 × 84.35
  4. Step 4: Simplify right side
    221.25x = 27,988.17
  5. Step 5: Solve for x
    x = 27,988.17/221.25
  6. Step 6: Final answer
    x = 126.50

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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.