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Finding the Fourth Proportional to 439.39, 659.21 and 131.36

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Solution

The fourth proportional to 439.39, 659.21 and 131.36 is: 197.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.39 : 659.21 = 131.36 : x
  2. Step 2: Convert to fraction form
    439.39/659.21 = 131.36/x
  3. Step 3: Cross multiply
    439.39x = 659.21 × 131.36
  4. Step 4: Simplify right side
    439.39x = 86,589.87
  5. Step 5: Solve for x
    x = 86,589.87/439.39
  6. Step 6: Final answer
    x = 197.07

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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.