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Finding the Fourth Proportional to 682.55, 1,021.56 and 519.32

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Solution

The fourth proportional to 682.55, 1,021.56 and 519.32 is: 777.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.55 : 1,021.56 = 519.32 : x
  2. Step 2: Convert to fraction form
    682.55/1,021.56 = 519.32/x
  3. Step 3: Cross multiply
    682.55x = 1,021.56 × 519.32
  4. Step 4: Simplify right side
    682.55x = 530,516.54
  5. Step 5: Solve for x
    x = 530,516.54/682.55
  6. Step 6: Final answer
    x = 777.26

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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.