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Finding the Fourth Proportional to 439.75, 659.81 and 223.21

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Solution

The fourth proportional to 439.75, 659.81 and 223.21 is: 334.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.75 : 659.81 = 223.21 : x
  2. Step 2: Convert to fraction form
    439.75/659.81 = 223.21/x
  3. Step 3: Cross multiply
    439.75x = 659.81 × 223.21
  4. Step 4: Simplify right side
    439.75x = 147,276.19
  5. Step 5: Solve for x
    x = 147,276.19/439.75
  6. Step 6: Final answer
    x = 334.91

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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.