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Finding the Fourth Proportional to 518.95, 778.28 and 427.42

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Solution

The fourth proportional to 518.95, 778.28 and 427.42 is: 641.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.95 : 778.28 = 427.42 : x
  2. Step 2: Convert to fraction form
    518.95/778.28 = 427.42/x
  3. Step 3: Cross multiply
    518.95x = 778.28 × 427.42
  4. Step 4: Simplify right side
    518.95x = 332,651.27
  5. Step 5: Solve for x
    x = 332,651.27/518.95
  6. Step 6: Final answer
    x = 641.01

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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.