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Finding the Fourth Proportional to 260.55, 388.98 and 221.62

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Solution

The fourth proportional to 260.55, 388.98 and 221.62 is: 330.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.55 : 388.98 = 221.62 : x
  2. Step 2: Convert to fraction form
    260.55/388.98 = 221.62/x
  3. Step 3: Cross multiply
    260.55x = 388.98 × 221.62
  4. Step 4: Simplify right side
    260.55x = 86,205.75
  5. Step 5: Solve for x
    x = 86,205.75/260.55
  6. Step 6: Final answer
    x = 330.86

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.