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Finding the Fourth Proportional to 518.90, 774.27 and 515.85

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Solution

The fourth proportional to 518.90, 774.27 and 515.85 is: 769.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.90 : 774.27 = 515.85 : x
  2. Step 2: Convert to fraction form
    518.90/774.27 = 515.85/x
  3. Step 3: Cross multiply
    518.90x = 774.27 × 515.85
  4. Step 4: Simplify right side
    518.90x = 399,407.18
  5. Step 5: Solve for x
    x = 399,407.18/518.90
  6. Step 6: Final answer
    x = 769.73

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.