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Finding the Fourth Proportional to 636.97, 877.86 and 489.79

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Solution

The fourth proportional to 636.97, 877.86 and 489.79 is: 675.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.97 : 877.86 = 489.79 : x
  2. Step 2: Convert to fraction form
    636.97/877.86 = 489.79/x
  3. Step 3: Cross multiply
    636.97x = 877.86 × 489.79
  4. Step 4: Simplify right side
    636.97x = 429,967.05
  5. Step 5: Solve for x
    x = 429,967.05/636.97
  6. Step 6: Final answer
    x = 675.02

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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.