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Finding the Fourth Proportional to 636.80, 879.02 and 404.08

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Solution

The fourth proportional to 636.80, 879.02 and 404.08 is: 557.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.80 : 879.02 = 404.08 : x
  2. Step 2: Convert to fraction form
    636.80/879.02 = 404.08/x
  3. Step 3: Cross multiply
    636.80x = 879.02 × 404.08
  4. Step 4: Simplify right side
    636.80x = 355,194.40
  5. Step 5: Solve for x
    x = 355,194.40/636.80
  6. Step 6: Final answer
    x = 557.78

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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.