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Finding the Fourth Proportional to 406.21, 559.95 and 318.73

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Solution

The fourth proportional to 406.21, 559.95 and 318.73 is: 439.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.21 : 559.95 = 318.73 : x
  2. Step 2: Convert to fraction form
    406.21/559.95 = 318.73/x
  3. Step 3: Cross multiply
    406.21x = 559.95 × 318.73
  4. Step 4: Simplify right side
    406.21x = 178,472.86
  5. Step 5: Solve for x
    x = 178,472.86/406.21
  6. Step 6: Final answer
    x = 439.36

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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.