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Finding the Fourth Proportional to 517.80, 714.60 and 321.42

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Solution

The fourth proportional to 517.80, 714.60 and 321.42 is: 443.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.80 : 714.60 = 321.42 : x
  2. Step 2: Convert to fraction form
    517.80/714.60 = 321.42/x
  3. Step 3: Cross multiply
    517.80x = 714.60 × 321.42
  4. Step 4: Simplify right side
    517.80x = 229,686.73
  5. Step 5: Solve for x
    x = 229,686.73/517.80
  6. Step 6: Final answer
    x = 443.58

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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.