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Finding the Fourth Proportional to 662.20, 991.38 and 444.60

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Solution

The fourth proportional to 662.20, 991.38 and 444.60 is: 665.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    662.20 : 991.38 = 444.60 : x
  2. Step 2: Convert to fraction form
    662.20/991.38 = 444.60/x
  3. Step 3: Cross multiply
    662.20x = 991.38 × 444.60
  4. Step 4: Simplify right side
    662.20x = 440,767.55
  5. Step 5: Solve for x
    x = 440,767.55/662.20
  6. Step 6: Final answer
    x = 665.61

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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.