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Finding the Fourth Proportional to 221.03, 331.55 and 156.11

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Solution

The fourth proportional to 221.03, 331.55 and 156.11 is: 234.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.03 : 331.55 = 156.11 : x
  2. Step 2: Convert to fraction form
    221.03/331.55 = 156.11/x
  3. Step 3: Cross multiply
    221.03x = 331.55 × 156.11
  4. Step 4: Simplify right side
    221.03x = 51,755.83
  5. Step 5: Solve for x
    x = 51,755.83/221.03
  6. Step 6: Final answer
    x = 234.16

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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.