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Finding the Fourth Proportional to 418.43, 577.99 and 321.39

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Solution

The fourth proportional to 418.43, 577.99 and 321.39 is: 443.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.43 : 577.99 = 321.39 : x
  2. Step 2: Convert to fraction form
    418.43/577.99 = 321.39/x
  3. Step 3: Cross multiply
    418.43x = 577.99 × 321.39
  4. Step 4: Simplify right side
    418.43x = 185,760.21
  5. Step 5: Solve for x
    x = 185,760.21/418.43
  6. Step 6: Final answer
    x = 443.95

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.