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Finding the Fourth Proportional to 493.20, 680.49 and 306.68

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Solution

The fourth proportional to 493.20, 680.49 and 306.68 is: 423.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    493.20 : 680.49 = 306.68 : x
  2. Step 2: Convert to fraction form
    493.20/680.49 = 306.68/x
  3. Step 3: Cross multiply
    493.20x = 680.49 × 306.68
  4. Step 4: Simplify right side
    493.20x = 208,689.27
  5. Step 5: Solve for x
    x = 208,689.27/493.20
  6. Step 6: Final answer
    x = 423.13

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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.