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Finding the Fourth Proportional to 884.09, 1,221.61 and 636.23

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Solution

The fourth proportional to 884.09, 1,221.61 and 636.23 is: 879.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    884.09 : 1,221.61 = 636.23 : x
  2. Step 2: Convert to fraction form
    884.09/1,221.61 = 636.23/x
  3. Step 3: Cross multiply
    884.09x = 1,221.61 × 636.23
  4. Step 4: Simplify right side
    884.09x = 777,224.93
  5. Step 5: Solve for x
    x = 777,224.93/884.09
  6. Step 6: Final answer
    x = 879.12

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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.