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Finding the Fourth Proportional to 517.57, 714.36 and 321.25

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Solution

The fourth proportional to 517.57, 714.36 and 321.25 is: 443.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.57 : 714.36 = 321.25 : x
  2. Step 2: Convert to fraction form
    517.57/714.36 = 321.25/x
  3. Step 3: Cross multiply
    517.57x = 714.36 × 321.25
  4. Step 4: Simplify right side
    517.57x = 229,488.15
  5. Step 5: Solve for x
    x = 229,488.15/517.57
  6. Step 6: Final answer
    x = 443.40

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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.