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Finding the Fourth Proportional to 519.62, 775.68 and 445.70

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Solution

The fourth proportional to 519.62, 775.68 and 445.70 is: 665.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.62 : 775.68 = 445.70 : x
  2. Step 2: Convert to fraction form
    519.62/775.68 = 445.70/x
  3. Step 3: Cross multiply
    519.62x = 775.68 × 445.70
  4. Step 4: Simplify right side
    519.62x = 345,720.58
  5. Step 5: Solve for x
    x = 345,720.58/519.62
  6. Step 6: Final answer
    x = 665.33

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.