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Finding the Fourth Proportional to 447.20, 669.17 and 393.74

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Solution

The fourth proportional to 447.20, 669.17 and 393.74 is: 589.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.20 : 669.17 = 393.74 : x
  2. Step 2: Convert to fraction form
    447.20/669.17 = 393.74/x
  3. Step 3: Cross multiply
    447.20x = 669.17 × 393.74
  4. Step 4: Simplify right side
    447.20x = 263,473.68
  5. Step 5: Solve for x
    x = 263,473.68/447.20
  6. Step 6: Final answer
    x = 589.17

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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.