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Finding the Fourth Proportional to 439.19, 658.78 and 131.04

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Solution

The fourth proportional to 439.19, 658.78 and 131.04 is: 196.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.19 : 658.78 = 131.04 : x
  2. Step 2: Convert to fraction form
    439.19/658.78 = 131.04/x
  3. Step 3: Cross multiply
    439.19x = 658.78 × 131.04
  4. Step 4: Simplify right side
    439.19x = 86,328.67
  5. Step 5: Solve for x
    x = 86,328.67/439.19
  6. Step 6: Final answer
    x = 196.56

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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.