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Finding the Fourth Proportional to 447.12, 612.90 and 439.56

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Solution

The fourth proportional to 447.12, 612.90 and 439.56 is: 602.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.12 : 612.90 = 439.56 : x
  2. Step 2: Convert to fraction form
    447.12/612.90 = 439.56/x
  3. Step 3: Cross multiply
    447.12x = 612.90 × 439.56
  4. Step 4: Simplify right side
    447.12x = 269,406.32
  5. Step 5: Solve for x
    x = 269,406.32/447.12
  6. Step 6: Final answer
    x = 602.54

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.