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Finding the Fourth Proportional to 518, 714.99 and 321.42

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Solution

The fourth proportional to 518, 714.99 and 321.42 is: 443.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    518 : 714.99 = 321.42 : x
  2. Step 2: Convert to fraction form
    518/714.99 = 321.42/x
  3. Step 3: Cross multiply
    518x = 714.99 × 321.42
  4. Step 4: Simplify right side
    518x = 229,812.09
  5. Step 5: Solve for x
    x = 229,812.09/518
  6. Step 6: Final answer
    x = 443.65

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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.