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Finding the Fourth Proportional to 221.77, 305.81 and 190.79

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Solution

The fourth proportional to 221.77, 305.81 and 190.79 is: 263.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.77 : 305.81 = 190.79 : x
  2. Step 2: Convert to fraction form
    221.77/305.81 = 190.79/x
  3. Step 3: Cross multiply
    221.77x = 305.81 × 190.79
  4. Step 4: Simplify right side
    221.77x = 58,345.49
  5. Step 5: Solve for x
    x = 58,345.49/221.77
  6. Step 6: Final answer
    x = 263.09

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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.