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Finding the Fourth Proportional to 439.98, 660.40 and 196.68

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Solution

The fourth proportional to 439.98, 660.40 and 196.68 is: 295.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.98 : 660.40 = 196.68 : x
  2. Step 2: Convert to fraction form
    439.98/660.40 = 196.68/x
  3. Step 3: Cross multiply
    439.98x = 660.40 × 196.68
  4. Step 4: Simplify right side
    439.98x = 129,887.47
  5. Step 5: Solve for x
    x = 129,887.47/439.98
  6. Step 6: Final answer
    x = 295.21

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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.