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Finding the Fourth Proportional to 518.36, 778.96 and 515.52

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Solution

The fourth proportional to 518.36, 778.96 and 515.52 is: 774.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.36 : 778.96 = 515.52 : x
  2. Step 2: Convert to fraction form
    518.36/778.96 = 515.52/x
  3. Step 3: Cross multiply
    518.36x = 778.96 × 515.52
  4. Step 4: Simplify right side
    518.36x = 401,569.46
  5. Step 5: Solve for x
    x = 401,569.46/518.36
  6. Step 6: Final answer
    x = 774.69

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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.