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Finding the Fourth Proportional to 518.72, 778.07 and 355.91

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Solution

The fourth proportional to 518.72, 778.07 and 355.91 is: 533.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.72 : 778.07 = 355.91 : x
  2. Step 2: Convert to fraction form
    518.72/778.07 = 355.91/x
  3. Step 3: Cross multiply
    518.72x = 778.07 × 355.91
  4. Step 4: Simplify right side
    518.72x = 276,919.89
  5. Step 5: Solve for x
    x = 276,919.89/518.72
  6. Step 6: Final answer
    x = 533.86

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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.