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Finding the Fourth Proportional to 636.98, 879.48 and 401

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Solution

The fourth proportional to 636.98, 879.48 and 401 is: 553.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.98 : 879.48 = 401 : x
  2. Step 2: Convert to fraction form
    636.98/879.48 = 401/x
  3. Step 3: Cross multiply
    636.98x = 879.48 × 401
  4. Step 4: Simplify right side
    636.98x = 352,671.48
  5. Step 5: Solve for x
    x = 352,671.48/636.98
  6. Step 6: Final answer
    x = 553.66

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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.