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Finding the Fourth Proportional to 637.22, 879.21 and 404.26

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Solution

The fourth proportional to 637.22, 879.21 and 404.26 is: 557.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    637.22 : 879.21 = 404.26 : x
  2. Step 2: Convert to fraction form
    637.22/879.21 = 404.26/x
  3. Step 3: Cross multiply
    637.22x = 879.21 × 404.26
  4. Step 4: Simplify right side
    637.22x = 355,429.43
  5. Step 5: Solve for x
    x = 355,429.43/637.22
  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.