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Finding the Fourth Proportional to 517.56, 714.34 and 321.20

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Solution

The fourth proportional to 517.56, 714.34 and 321.20 is: 443.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.56 : 714.34 = 321.20 : x
  2. Step 2: Convert to fraction form
    517.56/714.34 = 321.20/x
  3. Step 3: Cross multiply
    517.56x = 714.34 × 321.20
  4. Step 4: Simplify right side
    517.56x = 229,446.01
  5. Step 5: Solve for x
    x = 229,446.01/517.56
  6. Step 6: Final answer
    x = 443.32

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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.