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Finding the Fourth Proportional to 260.80, 391.21 and 98.39

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Solution

The fourth proportional to 260.80, 391.21 and 98.39 is: 147.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.80 : 391.21 = 98.39 : x
  2. Step 2: Convert to fraction form
    260.80/391.21 = 98.39/x
  3. Step 3: Cross multiply
    260.80x = 391.21 × 98.39
  4. Step 4: Simplify right side
    260.80x = 38,491.88
  5. Step 5: Solve for x
    x = 38,491.88/260.80
  6. Step 6: Final answer
    x = 147.59

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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.