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Finding the Fourth Proportional to 518.95, 777.60 and 415.69

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Solution

The fourth proportional to 518.95, 777.60 and 415.69 is: 622.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.95 : 777.60 = 415.69 : x
  2. Step 2: Convert to fraction form
    518.95/777.60 = 415.69/x
  3. Step 3: Cross multiply
    518.95x = 777.60 × 415.69
  4. Step 4: Simplify right side
    518.95x = 323,240.54
  5. Step 5: Solve for x
    x = 323,240.54/518.95
  6. Step 6: Final answer
    x = 622.87

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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.