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Finding the Fourth Proportional to 493.28, 680.72 and 318.96

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Solution

The fourth proportional to 493.28, 680.72 and 318.96 is: 440.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    493.28 : 680.72 = 318.96 : x
  2. Step 2: Convert to fraction form
    493.28/680.72 = 318.96/x
  3. Step 3: Cross multiply
    493.28x = 680.72 × 318.96
  4. Step 4: Simplify right side
    493.28x = 217,122.45
  5. Step 5: Solve for x
    x = 217,122.45/493.28
  6. Step 6: Final answer
    x = 440.16

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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.