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Finding the Fourth Proportional to 260.80, 359.04 and 221.76

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Solution

The fourth proportional to 260.80, 359.04 and 221.76 is: 305.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.80 : 359.04 = 221.76 : x
  2. Step 2: Convert to fraction form
    260.80/359.04 = 221.76/x
  3. Step 3: Cross multiply
    260.80x = 359.04 × 221.76
  4. Step 4: Simplify right side
    260.80x = 79,620.71
  5. Step 5: Solve for x
    x = 79,620.71/260.80
  6. Step 6: Final answer
    x = 305.29

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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.