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Finding the Fourth Proportional to 221.63, 332.28 and 84.57

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Solution

The fourth proportional to 221.63, 332.28 and 84.57 is: 126.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.63 : 332.28 = 84.57 : x
  2. Step 2: Convert to fraction form
    221.63/332.28 = 84.57/x
  3. Step 3: Cross multiply
    221.63x = 332.28 × 84.57
  4. Step 4: Simplify right side
    221.63x = 28,100.92
  5. Step 5: Solve for x
    x = 28,100.92/221.63
  6. Step 6: Final answer
    x = 126.79

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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.