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Finding the Fourth Proportional to 221.13, 305.15 and 122.89

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Solution

The fourth proportional to 221.13, 305.15 and 122.89 is: 169.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.13 : 305.15 = 122.89 : x
  2. Step 2: Convert to fraction form
    221.13/305.15 = 122.89/x
  3. Step 3: Cross multiply
    221.13x = 305.15 × 122.89
  4. Step 4: Simplify right side
    221.13x = 37,497.74
  5. Step 5: Solve for x
    x = 37,497.74/221.13
  6. Step 6: Final answer
    x = 169.57

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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.