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Finding the Fourth Proportional to 451.85, 678.69 and 439.09

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Solution

The fourth proportional to 451.85, 678.69 and 439.09 is: 659.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    451.85 : 678.69 = 439.09 : x
  2. Step 2: Convert to fraction form
    451.85/678.69 = 439.09/x
  3. Step 3: Cross multiply
    451.85x = 678.69 × 439.09
  4. Step 4: Simplify right side
    451.85x = 298,003.80
  5. Step 5: Solve for x
    x = 298,003.80/451.85
  6. Step 6: Final answer
    x = 659.52

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.