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Finding the Fourth Proportional to 260.76, 391.32 and 259.68

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Solution

The fourth proportional to 260.76, 391.32 and 259.68 is: 389.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.76 : 391.32 = 259.68 : x
  2. Step 2: Convert to fraction form
    260.76/391.32 = 259.68/x
  3. Step 3: Cross multiply
    260.76x = 391.32 × 259.68
  4. Step 4: Simplify right side
    260.76x = 101,617.98
  5. Step 5: Solve for x
    x = 101,617.98/260.76
  6. Step 6: Final answer
    x = 389.70

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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.