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Finding the Fourth Proportional to 221.22, 305.33 and 155.81

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Solution

The fourth proportional to 221.22, 305.33 and 155.81 is: 215.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.22 : 305.33 = 155.81 : x
  2. Step 2: Convert to fraction form
    221.22/305.33 = 155.81/x
  3. Step 3: Cross multiply
    221.22x = 305.33 × 155.81
  4. Step 4: Simplify right side
    221.22x = 47,573.47
  5. Step 5: Solve for x
    x = 47,573.47/221.22
  6. Step 6: Final answer
    x = 215.05

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.