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Finding the Fourth Proportional to 517.71, 714.42 and 321.33

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Solution

The fourth proportional to 517.71, 714.42 and 321.33 is: 443.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.71 : 714.42 = 321.33 : x
  2. Step 2: Convert to fraction form
    517.71/714.42 = 321.33/x
  3. Step 3: Cross multiply
    517.71x = 714.42 × 321.33
  4. Step 4: Simplify right side
    517.71x = 229,564.58
  5. Step 5: Solve for x
    x = 229,564.58/517.71
  6. Step 6: Final answer
    x = 443.42

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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.