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Finding the Fourth Proportional to 619.38, 930.96 and 518.04

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Solution

The fourth proportional to 619.38, 930.96 and 518.04 is: 778.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.38 : 930.96 = 518.04 : x
  2. Step 2: Convert to fraction form
    619.38/930.96 = 518.04/x
  3. Step 3: Cross multiply
    619.38x = 930.96 × 518.04
  4. Step 4: Simplify right side
    619.38x = 482,274.52
  5. Step 5: Solve for x
    x = 482,274.52/619.38
  6. Step 6: Final answer
    x = 778.64

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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.