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Finding the Fourth Proportional to 221.11, 305.13 and 122.87

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Solution

The fourth proportional to 221.11, 305.13 and 122.87 is: 169.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.11 : 305.13 = 122.87 : x
  2. Step 2: Convert to fraction form
    221.11/305.13 = 122.87/x
  3. Step 3: Cross multiply
    221.11x = 305.13 × 122.87
  4. Step 4: Simplify right side
    221.11x = 37,491.32
  5. Step 5: Solve for x
    x = 37,491.32/221.11
  6. Step 6: Final answer
    x = 169.56

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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.