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Finding the Fourth Proportional to 221.04, 305.17 and 155.61

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Solution

The fourth proportional to 221.04, 305.17 and 155.61 is: 214.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.04 : 305.17 = 155.61 : x
  2. Step 2: Convert to fraction form
    221.04/305.17 = 155.61/x
  3. Step 3: Cross multiply
    221.04x = 305.17 × 155.61
  4. Step 4: Simplify right side
    221.04x = 47,487.11
  5. Step 5: Solve for x
    x = 47,487.11/221.04
  6. Step 6: Final answer
    x = 214.83

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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.