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Finding the Fourth Proportional to 260.68, 391.09 and 87.39

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Solution

The fourth proportional to 260.68, 391.09 and 87.39 is: 131.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.68 : 391.09 = 87.39 : x
  2. Step 2: Convert to fraction form
    260.68/391.09 = 87.39/x
  3. Step 3: Cross multiply
    260.68x = 391.09 × 87.39
  4. Step 4: Simplify right side
    260.68x = 34,177.36
  5. Step 5: Solve for x
    x = 34,177.36/260.68
  6. Step 6: Final answer
    x = 131.11

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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.