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Finding the Fourth Proportional to 221.76, 332.28 and 191.25

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Solution

The fourth proportional to 221.76, 332.28 and 191.25 is: 286.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.76 : 332.28 = 191.25 : x
  2. Step 2: Convert to fraction form
    221.76/332.28 = 191.25/x
  3. Step 3: Cross multiply
    221.76x = 332.28 × 191.25
  4. Step 4: Simplify right side
    221.76x = 63,548.55
  5. Step 5: Solve for x
    x = 63,548.55/221.76
  6. Step 6: Final answer
    x = 286.56

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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.