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Finding the Fourth Proportional to 439.21, 661.83 and 363.87

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Solution

The fourth proportional to 439.21, 661.83 and 363.87 is: 548.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.21 : 661.83 = 363.87 : x
  2. Step 2: Convert to fraction form
    439.21/661.83 = 363.87/x
  3. Step 3: Cross multiply
    439.21x = 661.83 × 363.87
  4. Step 4: Simplify right side
    439.21x = 240,820.08
  5. Step 5: Solve for x
    x = 240,820.08/439.21
  6. Step 6: Final answer
    x = 548.30

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.