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Finding the Fourth Proportional to 221.22, 331.70 and 91.08

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Solution

The fourth proportional to 221.22, 331.70 and 91.08 is: 136.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.22 : 331.70 = 91.08 : x
  2. Step 2: Convert to fraction form
    221.22/331.70 = 91.08/x
  3. Step 3: Cross multiply
    221.22x = 331.70 × 91.08
  4. Step 4: Simplify right side
    221.22x = 30,210.30
  5. Step 5: Solve for x
    x = 30,210.30/221.22
  6. Step 6: Final answer
    x = 136.56

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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.