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Finding the Fourth Proportional to 517.38, 713.94 and 320.90

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Solution

The fourth proportional to 517.38, 713.94 and 320.90 is: 442.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.38 : 713.94 = 320.90 : x
  2. Step 2: Convert to fraction form
    517.38/713.94 = 320.90/x
  3. Step 3: Cross multiply
    517.38x = 713.94 × 320.90
  4. Step 4: Simplify right side
    517.38x = 229,103.35
  5. Step 5: Solve for x
    x = 229,103.35/517.38
  6. Step 6: Final answer
    x = 442.81

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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.