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Finding the Fourth Proportional to 517.91, 714.89 and 321.53

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Solution

The fourth proportional to 517.91, 714.89 and 321.53 is: 443.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.91 : 714.89 = 321.53 : x
  2. Step 2: Convert to fraction form
    517.91/714.89 = 321.53/x
  3. Step 3: Cross multiply
    517.91x = 714.89 × 321.53
  4. Step 4: Simplify right side
    517.91x = 229,858.58
  5. Step 5: Solve for x
    x = 229,858.58/517.91
  6. Step 6: Final answer
    x = 443.82

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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.