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Finding the Fourth Proportional to 221.35, 331.98 and 91.32

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Solution

The fourth proportional to 221.35, 331.98 and 91.32 is: 136.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.35 : 331.98 = 91.32 : x
  2. Step 2: Convert to fraction form
    221.35/331.98 = 91.32/x
  3. Step 3: Cross multiply
    221.35x = 331.98 × 91.32
  4. Step 4: Simplify right side
    221.35x = 30,316.41
  5. Step 5: Solve for x
    x = 30,316.41/221.35
  6. Step 6: Final answer
    x = 136.96

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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.