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Finding the Fourth Proportional to 479.28, 660.24 and 331.66

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Solution

The fourth proportional to 479.28, 660.24 and 331.66 is: 456.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.28 : 660.24 = 331.66 : x
  2. Step 2: Convert to fraction form
    479.28/660.24 = 331.66/x
  3. Step 3: Cross multiply
    479.28x = 660.24 × 331.66
  4. Step 4: Simplify right side
    479.28x = 218,975.20
  5. Step 5: Solve for x
    x = 218,975.20/479.28
  6. Step 6: Final answer
    x = 456.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.