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Finding the Fourth Proportional to 221.67, 332.60 and 135.20

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Solution

The fourth proportional to 221.67, 332.60 and 135.20 is: 202.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.67 : 332.60 = 135.20 : x
  2. Step 2: Convert to fraction form
    221.67/332.60 = 135.20/x
  3. Step 3: Cross multiply
    221.67x = 332.60 × 135.20
  4. Step 4: Simplify right side
    221.67x = 44,965.18
  5. Step 5: Solve for x
    x = 44,965.18/221.67
  6. Step 6: Final answer
    x = 202.85

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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.