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Finding the Fourth Proportional to 447.99, 620.77 and 420.58

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Solution

The fourth proportional to 447.99, 620.77 and 420.58 is: 582.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.99 : 620.77 = 420.58 : x
  2. Step 2: Convert to fraction form
    447.99/620.77 = 420.58/x
  3. Step 3: Cross multiply
    447.99x = 620.77 × 420.58
  4. Step 4: Simplify right side
    447.99x = 261,083.45
  5. Step 5: Solve for x
    x = 261,083.45/447.99
  6. Step 6: Final answer
    x = 582.79

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.