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Finding the Fourth Proportional to 682.08, 1,020.78 and 518.82

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Solution

The fourth proportional to 682.08, 1,020.78 and 518.82 is: 776.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.08 : 1,020.78 = 518.82 : x
  2. Step 2: Convert to fraction form
    682.08/1,020.78 = 518.82/x
  3. Step 3: Cross multiply
    682.08x = 1,020.78 × 518.82
  4. Step 4: Simplify right side
    682.08x = 529,601.08
  5. Step 5: Solve for x
    x = 529,601.08/682.08
  6. Step 6: Final answer
    x = 776.45

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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.