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Finding the Fourth Proportional to 493.13, 680.93 and 318.78

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Solution

The fourth proportional to 493.13, 680.93 and 318.78 is: 440.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    493.13 : 680.93 = 318.78 : x
  2. Step 2: Convert to fraction form
    493.13/680.93 = 318.78/x
  3. Step 3: Cross multiply
    493.13x = 680.93 × 318.78
  4. Step 4: Simplify right side
    493.13x = 217,065.27
  5. Step 5: Solve for x
    x = 217,065.27/493.13
  6. Step 6: Final answer
    x = 440.18

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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.