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Finding the Fourth Proportional to 260.11, 389.70 and 231.86

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Solution

The fourth proportional to 260.11, 389.70 and 231.86 is: 347.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.11 : 389.70 = 231.86 : x
  2. Step 2: Convert to fraction form
    260.11/389.70 = 231.86/x
  3. Step 3: Cross multiply
    260.11x = 389.70 × 231.86
  4. Step 4: Simplify right side
    260.11x = 90,352.73
  5. Step 5: Solve for x
    x = 90,352.73/260.11
  6. Step 6: Final answer
    x = 347.37

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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.