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Finding the Fourth Proportional to 682.79, 1,021.95 and 519.57

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Solution

The fourth proportional to 682.79, 1,021.95 and 519.57 is: 777.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.79 : 1,021.95 = 519.57 : x
  2. Step 2: Convert to fraction form
    682.79/1,021.95 = 519.57/x
  3. Step 3: Cross multiply
    682.79x = 1,021.95 × 519.57
  4. Step 4: Simplify right side
    682.79x = 530,974.56
  5. Step 5: Solve for x
    x = 530,974.56/682.79
  6. Step 6: Final answer
    x = 777.66

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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.