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Finding the Fourth Proportional to 872.27, 1,205.31 and 635.81

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Solution

The fourth proportional to 872.27, 1,205.31 and 635.81 is: 878.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.27 : 1,205.31 = 635.81 : x
  2. Step 2: Convert to fraction form
    872.27/1,205.31 = 635.81/x
  3. Step 3: Cross multiply
    872.27x = 1,205.31 × 635.81
  4. Step 4: Simplify right side
    872.27x = 766,342.12
  5. Step 5: Solve for x
    x = 766,342.12/872.27
  6. Step 6: Final answer
    x = 878.57

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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.