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Finding the Fourth Proportional to 260.10, 389.69 and 221.22

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Solution

The fourth proportional to 260.10, 389.69 and 221.22 is: 331.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.10 : 389.69 = 221.22 : x
  2. Step 2: Convert to fraction form
    260.10/389.69 = 221.22/x
  3. Step 3: Cross multiply
    260.10x = 389.69 × 221.22
  4. Step 4: Simplify right side
    260.10x = 86,207.22
  5. Step 5: Solve for x
    x = 86,207.22/260.10
  6. Step 6: Final answer
    x = 331.44

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.