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Finding the Fourth Proportional to 221.76, 303.82 and 213.45

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Solution

The fourth proportional to 221.76, 303.82 and 213.45 is: 292.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.76 : 303.82 = 213.45 : x
  2. Step 2: Convert to fraction form
    221.76/303.82 = 213.45/x
  3. Step 3: Cross multiply
    221.76x = 303.82 × 213.45
  4. Step 4: Simplify right side
    221.76x = 64,849.45
  5. Step 5: Solve for x
    x = 64,849.45/221.76
  6. Step 6: Final answer
    x = 292.43

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.