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Finding the Fourth Proportional to 260.91, 391.02 and 145.38

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Solution

The fourth proportional to 260.91, 391.02 and 145.38 is: 217.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.91 : 391.02 = 145.38 : x
  2. Step 2: Convert to fraction form
    260.91/391.02 = 145.38/x
  3. Step 3: Cross multiply
    260.91x = 391.02 × 145.38
  4. Step 4: Simplify right side
    260.91x = 56,846.49
  5. Step 5: Solve for x
    x = 56,846.49/260.91
  6. Step 6: Final answer
    x = 217.88

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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.