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Finding the Fourth Proportional to 439.45, 659.22 and 131.29

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Solution

The fourth proportional to 439.45, 659.22 and 131.29 is: 196.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.45 : 659.22 = 131.29 : x
  2. Step 2: Convert to fraction form
    439.45/659.22 = 131.29/x
  3. Step 3: Cross multiply
    439.45x = 659.22 × 131.29
  4. Step 4: Simplify right side
    439.45x = 86,545.04
  5. Step 5: Solve for x
    x = 86,545.04/439.45
  6. Step 6: Final answer
    x = 196.94

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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.