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Finding the Fourth Proportional to 631.86, 872.06 and 396.05

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Solution

The fourth proportional to 631.86, 872.06 and 396.05 is: 546.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.86 : 872.06 = 396.05 : x
  2. Step 2: Convert to fraction form
    631.86/872.06 = 396.05/x
  3. Step 3: Cross multiply
    631.86x = 872.06 × 396.05
  4. Step 4: Simplify right side
    631.86x = 345,379.36
  5. Step 5: Solve for x
    x = 345,379.36/631.86
  6. Step 6: Final answer
    x = 546.61

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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.