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Finding the Fourth Proportional to 259.25, 356.94 and 221.84

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Solution

The fourth proportional to 259.25, 356.94 and 221.84 is: 305.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.25 : 356.94 = 221.84 : x
  2. Step 2: Convert to fraction form
    259.25/356.94 = 221.84/x
  3. Step 3: Cross multiply
    259.25x = 356.94 × 221.84
  4. Step 4: Simplify right side
    259.25x = 79,183.57
  5. Step 5: Solve for x
    x = 79,183.57/259.25
  6. Step 6: Final answer
    x = 305.43

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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.