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Finding the Fourth Proportional to 260.91, 391.17 and 209.54

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Solution

The fourth proportional to 260.91, 391.17 and 209.54 is: 314.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.91 : 391.17 = 209.54 : x
  2. Step 2: Convert to fraction form
    260.91/391.17 = 209.54/x
  3. Step 3: Cross multiply
    260.91x = 391.17 × 209.54
  4. Step 4: Simplify right side
    260.91x = 81,963.81
  5. Step 5: Solve for x
    x = 81,963.81/260.91
  6. Step 6: Final answer
    x = 314.15

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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.