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Finding the Fourth Proportional to 884.65, 1,220.95 and 636.79

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Solution

The fourth proportional to 884.65, 1,220.95 and 636.79 is: 878.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    884.65 : 1,220.95 = 636.79 : x
  2. Step 2: Convert to fraction form
    884.65/1,220.95 = 636.79/x
  3. Step 3: Cross multiply
    884.65x = 1,220.95 × 636.79
  4. Step 4: Simplify right side
    884.65x = 777,488.75
  5. Step 5: Solve for x
    x = 777,488.75/884.65
  6. Step 6: Final answer
    x = 878.87

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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.