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Finding the Fourth Proportional to 518.41, 778.41 and 313.88

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Solution

The fourth proportional to 518.41, 778.41 and 313.88 is: 471.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.41 : 778.41 = 313.88 : x
  2. Step 2: Convert to fraction form
    518.41/778.41 = 313.88/x
  3. Step 3: Cross multiply
    518.41x = 778.41 × 313.88
  4. Step 4: Simplify right side
    518.41x = 244,329.28
  5. Step 5: Solve for x
    x = 244,329.28/518.41
  6. Step 6: Final answer
    x = 471.31

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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.