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Finding the Fourth Proportional to 441.55, 661.40 and 426.09

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Solution

The fourth proportional to 441.55, 661.40 and 426.09 is: 638.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    441.55 : 661.40 = 426.09 : x
  2. Step 2: Convert to fraction form
    441.55/661.40 = 426.09/x
  3. Step 3: Cross multiply
    441.55x = 661.40 × 426.09
  4. Step 4: Simplify right side
    441.55x = 281,817.87
  5. Step 5: Solve for x
    x = 281,817.87/441.55
  6. Step 6: Final answer
    x = 638.24

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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.