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Finding the Fourth Proportional to 518.14, 776.44 and 408.72

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Solution

The fourth proportional to 518.14, 776.44 and 408.72 is: 612.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.14 : 776.44 = 408.72 : x
  2. Step 2: Convert to fraction form
    518.14/776.44 = 408.72/x
  3. Step 3: Cross multiply
    518.14x = 776.44 × 408.72
  4. Step 4: Simplify right side
    518.14x = 317,346.56
  5. Step 5: Solve for x
    x = 317,346.56/518.14
  6. Step 6: Final answer
    x = 612.47

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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.