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Finding the Fourth Proportional to 520.18, 718.21 and 323.78

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Solution

The fourth proportional to 520.18, 718.21 and 323.78 is: 447.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.18 : 718.21 = 323.78 : x
  2. Step 2: Convert to fraction form
    520.18/718.21 = 323.78/x
  3. Step 3: Cross multiply
    520.18x = 718.21 × 323.78
  4. Step 4: Simplify right side
    520.18x = 232,542.03
  5. Step 5: Solve for x
    x = 232,542.03/520.18
  6. Step 6: Final answer
    x = 447.04

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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.