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Finding the Fourth Proportional to 221.60, 331.86 and 156.43

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Solution

The fourth proportional to 221.60, 331.86 and 156.43 is: 234.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.60 : 331.86 = 156.43 : x
  2. Step 2: Convert to fraction form
    221.60/331.86 = 156.43/x
  3. Step 3: Cross multiply
    221.60x = 331.86 × 156.43
  4. Step 4: Simplify right side
    221.60x = 51,913.86
  5. Step 5: Solve for x
    x = 51,913.86/221.60
  6. Step 6: Final answer
    x = 234.27

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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.