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Finding the Fourth Proportional to 221.76, 332.46 and 84.78

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Solution

The fourth proportional to 221.76, 332.46 and 84.78 is: 127.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.76 : 332.46 = 84.78 : x
  2. Step 2: Convert to fraction form
    221.76/332.46 = 84.78/x
  3. Step 3: Cross multiply
    221.76x = 332.46 × 84.78
  4. Step 4: Simplify right side
    221.76x = 28,185.96
  5. Step 5: Solve for x
    x = 28,185.96/221.76
  6. Step 6: Final answer
    x = 127.10

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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.