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Finding the Fourth Proportional to 260.21, 389.86 and 191.90

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Solution

The fourth proportional to 260.21, 389.86 and 191.90 is: 287.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.21 : 389.86 = 191.90 : x
  2. Step 2: Convert to fraction form
    260.21/389.86 = 191.90/x
  3. Step 3: Cross multiply
    260.21x = 389.86 × 191.90
  4. Step 4: Simplify right side
    260.21x = 74,814.13
  5. Step 5: Solve for x
    x = 74,814.13/260.21
  6. Step 6: Final answer
    x = 287.51

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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.