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Finding the Fourth Proportional to 493.92, 680.84 and 388.76

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Solution

The fourth proportional to 493.92, 680.84 and 388.76 is: 535.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    493.92 : 680.84 = 388.76 : x
  2. Step 2: Convert to fraction form
    493.92/680.84 = 388.76/x
  3. Step 3: Cross multiply
    493.92x = 680.84 × 388.76
  4. Step 4: Simplify right side
    493.92x = 264,683.36
  5. Step 5: Solve for x
    x = 264,683.36/493.92
  6. Step 6: Final answer
    x = 535.88

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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.