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Finding the Fourth Proportional to 518.20, 776.28 and 274.12

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Solution

The fourth proportional to 518.20, 776.28 and 274.12 is: 410.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.20 : 776.28 = 274.12 : x
  2. Step 2: Convert to fraction form
    518.20/776.28 = 274.12/x
  3. Step 3: Cross multiply
    518.20x = 776.28 × 274.12
  4. Step 4: Simplify right side
    518.20x = 212,793.87
  5. Step 5: Solve for x
    x = 212,793.87/518.20
  6. Step 6: Final answer
    x = 410.64

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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.