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Finding the Fourth Proportional to 519.46, 779.18 and 427.79

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Solution

The fourth proportional to 519.46, 779.18 and 427.79 is: 641.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.46 : 779.18 = 427.79 : x
  2. Step 2: Convert to fraction form
    519.46/779.18 = 427.79/x
  3. Step 3: Cross multiply
    519.46x = 779.18 × 427.79
  4. Step 4: Simplify right side
    519.46x = 333,319.38
  5. Step 5: Solve for x
    x = 333,319.38/519.46
  6. Step 6: Final answer
    x = 641.67

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.