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Finding the Fourth Proportional to 260.20, 390 and 191.32

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Solution

The fourth proportional to 260.20, 390 and 191.32 is: 286.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.20 : 390 = 191.32 : x
  2. Step 2: Convert to fraction form
    260.20/390 = 191.32/x
  3. Step 3: Cross multiply
    260.20x = 390 × 191.32
  4. Step 4: Simplify right side
    260.20x = 74,614.80
  5. Step 5: Solve for x
    x = 74,614.80/260.20
  6. Step 6: Final answer
    x = 286.76

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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.