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Finding the Fourth Proportional to 636.99, 879.14 and 401.18

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Solution

The fourth proportional to 636.99, 879.14 and 401.18 is: 553.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.99 : 879.14 = 401.18 : x
  2. Step 2: Convert to fraction form
    636.99/879.14 = 401.18/x
  3. Step 3: Cross multiply
    636.99x = 879.14 × 401.18
  4. Step 4: Simplify right side
    636.99x = 352,686.98
  5. Step 5: Solve for x
    x = 352,686.98/636.99
  6. Step 6: Final answer
    x = 553.68

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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.