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Finding the Fourth Proportional to 518.20, 778.21 and 356.60

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Solution

The fourth proportional to 518.20, 778.21 and 356.60 is: 535.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.20 : 778.21 = 356.60 : x
  2. Step 2: Convert to fraction form
    518.20/778.21 = 356.60/x
  3. Step 3: Cross multiply
    518.20x = 778.21 × 356.60
  4. Step 4: Simplify right side
    518.20x = 277,510.74
  5. Step 5: Solve for x
    x = 277,510.74/518.20
  6. Step 6: Final answer
    x = 535.53

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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.