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Finding the Fourth Proportional to 447.92, 616.78 and 388.84

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Solution

The fourth proportional to 447.92, 616.78 and 388.84 is: 535.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.92 : 616.78 = 388.84 : x
  2. Step 2: Convert to fraction form
    447.92/616.78 = 388.84/x
  3. Step 3: Cross multiply
    447.92x = 616.78 × 388.84
  4. Step 4: Simplify right side
    447.92x = 239,826.79
  5. Step 5: Solve for x
    x = 239,826.79/447.92
  6. Step 6: Final answer
    x = 535.42

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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.