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Finding the Fourth Proportional to 221.12, 305.20 and 155.64

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Solution

The fourth proportional to 221.12, 305.20 and 155.64 is: 214.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.12 : 305.20 = 155.64 : x
  2. Step 2: Convert to fraction form
    221.12/305.20 = 155.64/x
  3. Step 3: Cross multiply
    221.12x = 305.20 × 155.64
  4. Step 4: Simplify right side
    221.12x = 47,501.33
  5. Step 5: Solve for x
    x = 47,501.33/221.12
  6. Step 6: Final answer
    x = 214.82

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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.