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Finding the Fourth Proportional to 635.49, 877.07 and 399.68

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Solution

The fourth proportional to 635.49, 877.07 and 399.68 is: 551.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    635.49 : 877.07 = 399.68 : x
  2. Step 2: Convert to fraction form
    635.49/877.07 = 399.68/x
  3. Step 3: Cross multiply
    635.49x = 877.07 × 399.68
  4. Step 4: Simplify right side
    635.49x = 350,540.95
  5. Step 5: Solve for x
    x = 350,540.95/635.49
  6. Step 6: Final answer
    x = 551.61

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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.