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Finding the Fourth Proportional to 447.20, 616.92 and 315.92

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Solution

The fourth proportional to 447.20, 616.92 and 315.92 is: 435.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.20 : 616.92 = 315.92 : x
  2. Step 2: Convert to fraction form
    447.20/616.92 = 315.92/x
  3. Step 3: Cross multiply
    447.20x = 616.92 × 315.92
  4. Step 4: Simplify right side
    447.20x = 194,897.37
  5. Step 5: Solve for x
    x = 194,897.37/447.20
  6. Step 6: Final answer
    x = 435.82

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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.