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Finding the Fourth Proportional to 636.33, 877.44 and 489.31

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Solution

The fourth proportional to 636.33, 877.44 and 489.31 is: 674.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.33 : 877.44 = 489.31 : x
  2. Step 2: Convert to fraction form
    636.33/877.44 = 489.31/x
  3. Step 3: Cross multiply
    636.33x = 877.44 × 489.31
  4. Step 4: Simplify right side
    636.33x = 429,340.17
  5. Step 5: Solve for x
    x = 429,340.17/636.33
  6. Step 6: Final answer
    x = 674.71

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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.