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Finding the Fourth Proportional to 439.81, 659.30 and 196.20

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Solution

The fourth proportional to 439.81, 659.30 and 196.20 is: 294.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.81 : 659.30 = 196.20 : x
  2. Step 2: Convert to fraction form
    439.81/659.30 = 196.20/x
  3. Step 3: Cross multiply
    439.81x = 659.30 × 196.20
  4. Step 4: Simplify right side
    439.81x = 129,353.68
  5. Step 5: Solve for x
    x = 129,353.68/439.81
  6. Step 6: Final answer
    x = 294.11

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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.