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Finding the Fourth Proportional to 260.05, 389.85 and 129.97

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Solution

The fourth proportional to 260.05, 389.85 and 129.97 is: 194.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.05 : 389.85 = 129.97 : x
  2. Step 2: Convert to fraction form
    260.05/389.85 = 129.97/x
  3. Step 3: Cross multiply
    260.05x = 389.85 × 129.97
  4. Step 4: Simplify right side
    260.05x = 50,668.80
  5. Step 5: Solve for x
    x = 50,668.80/260.05
  6. Step 6: Final answer
    x = 194.84

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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.